How to replace RO membranes?

RO membrane (reverse osmosis membrane) is the most important part of a home drinking water purifier, like the heart of this water purification system.
Tap water must be filtered through RO membrane to become pure water that can be drunk directly. As we all know, RO membrane needs to be replaced about 1 time/year or 1 time/2 years. Many people will choose to find a person, a professional company to come to the place to replace. In fact, it is not necessary. Replacing the membrane is actually very simple. We can do it ourselves to save more cost and time and to better understand the filter system we are using.

Hướng dẫn thay màng RO bộ lọc nước gia đình

Before replacing the RO membrane, we must know what type of RO membrane in your water purifier is (see catalogs, manuals from where you bought the purifier, or contact Song Phung company for support). We can take it out of the membrane housing, see the model number on the label, or check the RO membrane model online on the membrane supplier’s website.
For water purifiers, different membranes will have different functions, but the difference is not large because the general principle is the same, the physical dimensions of the membrane are the same. The desalination rate can reach 97% or higher depending on the manufacturer, the filtered water can be drunk directly without cooking.

Instructions for RO membrane with pictures, please see more here

+ Cause:

– Due to the water pump short circuit.
– Due to the voltage applied to the water pump is too high, it is not intended for use.
– Due to the water pump operating in a state of no water supply for too long, it will lead to burning of the seal, when the seal is damaged, water will enter the electric motor compartment, resulting in a not working.
– Due to  water pump seal failure.
– Due to damaged thermal relay, the pump cannot be automatically disconnected.
– The pump is flooded.
And there are many other reasons…

+ Remedies:

– Install the correct voltage for the water pump .
– Do not let the water pump work for too long in a state of no water supply.
– Regularly check the seal for damage, if damaged, it must be replaced
– Check the thermal relay for operation.
– Pay attention when the water is flooded, we have to remove the water pump to avoid the machine getting into the water.

Learn more about pump selection, please refer here

Q : When should I use a booster pump?

A :Booster pump suitable for families who need to use it without an overhead water tank, or the height is not enough to create pressure. The machine will automatically suck water in the tank, pipe, pump directly into the device. Depending on the actual needs to use more or less, choose the capacity accordingly

For private or collective buildings, especially hotels, it is also necessary to use a booster pump for the top floor of the building when the pressure is weak. Refer to the section Booster pumps for household use.

Learn more about pump selection, please refer here

Question :
Let me ask, I recently bought a Nation pump, but when running, because I put the machine in my house, it makes too much noise, I want to ask if I want to make a glass box or a wooden case to cover it, If it doesn’t make noise, is it okay, does it get hot, the pump takes about 45 minutes each time. Thank you!

Answer:  The Nation pump runs quite well, smoothly, and durable. In your case the machine is ringing, you need to check the following points:

– Has the tripod been fastened to the base?
– Is the water line up to standards: if the pipe is too long, zigzag, many bends, the machine will run at full capacity, so it is quite noisy. (Many cases are clogged pipes, rust, deposits)
– Machine is faulty: check by idling (no water supply) if running still has noise, need to take it for warranty.
After checking the above issues and still making noise, it is likely that the water pipe to your house is too small or the pump is high, the machine running at full capacity will be noisy. You can completely make a picture of soundproofing material on the pump, because the machine itself has a heat dissipation part thanks to running water and the machine’s power is also small: 200W, so it is completely responsive. (Remember that the water pump must have water)

Learn more about pump selection, please refer here

Question :
My house is in the central area of Hanoi, but the problem of domestic water is a dilemma, the house on the upper floor, wants to pump water’, had to use a 250w water pump to suck, but today it was. are not. Whenever you can, just pump yourself, when it’s full, it will automatically shut off and have an indicator light. And when the pump can’t be pumped, the machine will not run for 5, 6 hours => too bad. Now I want to make a temperature sensor, when the machine runs for a long time, it will heat up to 60 -> 70 degrees, then the sensor will close. 1 relay, but whatever the relay does, you can think about it later. I don’t know anything about electronics, can y

ou help me?

A : In my opinion, using a current sensor or a temperature sensor is also not possible. Because the:

1) The temperature sensor must be dependent on the environment so it is not effective.
2) The current sensor only applies to the motor running overloaded or stuck in the bearing, then the machine cannot run, so the current in the coils increases many times, while the machine is idling, it is still the same, even if it runs day has no effect. In my opinion, a mechanical sensor should be installed on the outlet of the  water pump.. When the pump runs, the water pressure affects the mechanical sensor, it will control an electronic circuit to help the machine run until the water is full, and when the pump is still running but the water does not come up, the mechanical sensor has no signal. signal, so do not let the  water pump  flow anymore.

Learn more about pump selection, please refer here

My family works in farming and aquaculture – seafood, due to work requirements, now I need to buy a  slurry pump. Please advise me on how to  buy a slurry pump . I thank you!

A :  According to the documentation, the selection of the pressure head of the slurry pump depends a lot on the speed of the slurry being pumped in the pipe. If the speed is higher, the head is also larger. When the speed is greater, the required head when pumping mud increases proportionally to the head when pumping water, the coefficient of increase can increase up to 20 times the head compared to water pump. The min boost factor is 4.

Learn more about pump selection, please refer here

Learn more about how to choose a diaphragm pump for slurry pumping, please refer here

1. What is negative pressure?

To answer the question what is a negative pressure level, let’s have a general understanding of pressure.

Negative pressure in English is called “negative pressure” and a sound pressure gauge is called “negative pressure gauge”

Negative pressure is also known as vacuum negative pressure. Vacuum pressure is also known as vacuum degree. Negative pressure is calculated in many different types of units such as: Torr, Pa, mBar, mmHg [abs] … this is a measure of the pressure of the amount of matter present in a certain space.

áp suất âm

2. How does negative pressure affect the water filtration system?

When the negative pressure occurs inside the filter system, especially for the FRP filter tank, there will be a dent if the sound pressure is large enough, or if the sound pressure is smaller, it will cause the tank body to rise. down many times cracks the glass fiber layer, the process takes place many times over time, it will cause the filter tank to leak water

Learn more about negative pressure, please refer here


Jumbo probiotics are a mixture of strains of bacteria, yeasts and enzymes that are active on organic media (which is the contaminant) and grow biomass by doubling, maintaining the ability to process substances. organic for a long time.
There are two main types of probiotics: Jumbo A is an aerobic yeast and Jumbo G is an anaerobic yeast

Men vi sinh Jumbo A - G

Dosage of Jumbo probiotics is calculated as follows:

1. Dosage:

No. Probiotics Quantity Volume of clean water Volume of wastewater treated
01 Jumbo-A 01 kg 5 lít 2 m3
02 Jumbo-G 01 kg 5 lít 2 m3

Learn more about how to use probiotics, please refer here

How to install then distributor for FRP tank 4inch base

When you choose to buy a product FRP pressure filter tank of Song Phung Company for self-installation and use, there are a number of filters and accessories attached to the filter tank that you have never installed before, which will be very inconvenient if the technical direction over the phone for you to install
There are two main types of grid installation:
  • The top-mount installation type is the installation of the filter valve directly on the mouth of the filter tank
  • The side-mount installation type is the filter valve side tank .mounting type

Lưới dưới side

Learn more about how to install the filter, please refer here

1. Definition of TDS:

TDS stands for Total Dissolved Solid, which represents the total concentration of substances dissolved in water. TDS is made up of inorganic salts, as well as small amounts of organic matter. Common inorganic salts that can be found in water include calcium, magnesium, potassium, and sodium, all of which are cations, and carbonates, nitrates, bicarbonates, chlorides, and sulfates, all of which are anions. Cations are positively charged ions and anions are negatively charged ions.
TDS trong nước là gì

2. Causes of high TDS in water?

These minerals can originate from a number of sources, both natural and man-made as a result of human activities. Mineral springs contain water with a high concentration of dissolved solids, due to the water flowing through rocky areas with high salt content.
These minerals can also come from human activities. Agricultural and urban runoff can carry excess minerals into water bodies, as well as sewage, industrial wastewater, and salt used to de-icing roads.

3. What happens when the domestic water with TDS index is high?

To learn more about the TDS index, please refer here

What is pH in water? What pH is good for drinking water?

1. Definition of pH:

You may have heard the word “pH” used to describe drinking water quality, but do you know what it means?
pH is a measurement of electrically charged particles in a substance. It indicates how acidic or alkaline (base) the substance is. The pH scale ranges from 0 to 14: specifically acidic water has a pH lower than 7. The most acidic substances have a pH of 0 (Battery acids fall into this category), Alkaline water has a pH of 8 or higher. The most alkaline substances, such as lye, have a pH of 14. Pure water has a pH of 7 and is considered “neutral” because it is free of acids and basic substances.

2. What pH is safe for drinking water??

The United States Environmental Protection Agency (EPA) is responsible for monitoring the quality of public drinking water throughout the United States. pH is not a quality regulated by the EPA as it is considered the aesthetic quality of water. However, the agency recommends that municipal drinking water suppliers keep their water at a pH between 6.5 and 8.5, similar to the pH threshold for drinking water in Vietnam.
pH trong nước là gì

3. What does a changed or unsafe pH mean?

The pH of freshwater varies around the world depending on weather patterns, human activity, and natural processes. Water with a very low or high pH can be a sign of chemical or heavy metal contamination. Water is not in the “safe” pH range of 6.5 to 8.5, just because water is alkaline it does not mean it is unsafe. However, very alkaline water can have an unpleasant smell or taste and can damage pipes and plumbing fixtures.
Acidic water with a pH less than 6.5 is more likely to be contaminated with pollutants, making the water unsafe to drink. It can also corrode (dissolve) metal pipes.
Many municipal water suppliers voluntarily test the pH of their water to monitor for contaminants, which can be indicated by a changing pH. When contaminants are present, water companies treat their water to make it safe to drink again.

Learn more about the article pH index, please refer here


When you choose to buy a pressure filter tank product for self-installation, what type of filter material do you need to choose, how much is it?
Our Filter Material Calculator will help you with those problems
  1. What is filter media?

The filter media is the part of the filtration system that separates unwanted particles from the solution to be filtered. The type of material selected to be used in the filter tank depends on the quality of the inlet solution and the quality requirements of the output solution.

  1. Types of filter media

In general, filter media are very diverse, each type plays a goal in the filtration process. We list some common filter media types as follows to include in the worksheet:

Các loại vật liệu lọc

Learn more about the guide to choosing filter capacity and calculating filter media, please refer here

How to maintain an efficient RO system?

During the use of an RO (reverse osmosis) filtration system, the membrane will become contaminated and deposit residue. If it is not cleaned for a long time, it will affect the life of the RO membrane. So when we use an RO system, we must regularly check, clean, and maintain the reverse osmosis system properly.

How often is the reverse osmosis filtration system cleaned?

There is no uniform standard for the cleaning time of reverse osmosis system, but when the following situations occur in our reverse osmosis system, we need to carry out membrane cleaning of the reverse osmosis system reverse:

1. Standard permit flow (treated water flow) rates are reduced from 10% to 15%.
2. The pressure differential of the standard system is increased by 10% to 15%.
3. The desalination rate of the standard system is reduced from 1% to 2% or the salt content in the seepage water is increased significantly..

4. Contamination or scaling confirmed.

How to choose a cleaning chemical for reverse osmosis system?
The reverse osmosis system removes impurities such as bacteria and viruses from the water through the reverse osmosis principle of the membrane filter under pressure to meet different water usage needs. When the equipment is operated for a certain time, the filter membrane will be contaminated, the reverse osmosis membrane needs to be treated with cleaning chemicals.

Hướng dẫn bảo trì hệ thống RO đúng cách

Due to the different pollution situation, the type of detergent must be selected according to the quality of the incoming water. Another method is to take out one or two membranes to check the cleanliness to find the most suitable detergent from which the most suitable cleaning chemical can be selected to ensure the cleaning effect. Reverse osmosis equipment is not only used alone, but can also be combined with other equipment to produce ultrapure water, high purity water, etc. to meet the water needs of other industries. together.

Instructions for proper maintenance of RO systems – How to determine when to start maintenance, please refer here

Is a high RO recovery rate good? How much of this adjustment is reasonable?

The higher the recovery rate of the reverse osmosis membrane system, the better?

Reverse osmosis technology is the highest technology among man-made water production technologies today, the purity is almost 100%. The reverse osmosis element is used to improve the purity of the water and remove the impurities and salts present in the water.
When using reverse osmosis membranes for raw water treatment, the recovery rate of the membrane system, as an important performance indicator, is often of great interest. High recovery rate means strong output water capacity, save water, save power, resulting in cost savings.
So is the recovery rate of reverse osmosis membrane system higher the better?

Hướng dẫn bảo trì hệ thống RO đúng cách

1. What is the recovery rate of reverse osmosis membrane system?

Recovery rate refers to the percentage of water input in the membrane system that is converted to finished water. The recovery rate of the system is influenced by many factors such as the quality of the feed water, the number of membranes and the arrangement of the RO membranes according to the original design.

Small scale reverse osmosis equipment has a small number of membranes and a short water supply process, so the overall system recovery rate is low. Due to the large number of RO membranes in combination and the use of RO housings containing multiple membranes, which prolongs the water supply to each membrane shell, the actual system recovery rate is generally above 75%, and sometimes even reach 90%.

See more articles on how to adjust RO . system recovery rate


How to install filter distributor 6inch for FRP filter tank?

When you choose to buy a product FRP pressure filter tank of Song Phung Company for self-installation and use, there are a number of filters and accessories attached to the filter tank that you have never installed before, which will be very inconvenient if the technical direction over the phone for you to install
Our guide below will help you solve those problems

1. What is the top-mount installation type and top-mount distributor for 6inch base?

  • The top-mount installation type is the installation of the filter valve directly on the mouth of the filter tank, for example as shown in the following figure.:

Hướng dẫn lắp đặt lưới top-mount, side-mount miệng 6inch bồn lọc FRP