Reverse osmosis pure water filtration system with high TDS value treatment

General reverse osmosis pure water filtration system product water TDS≤50 can use as direct drinking water. However, even if the system is installed, the product water TDS value still high, then it is suspected that there is a problem with the quality of the system.

1. TDS measurement method

General end customers or distributors are accustomed to testing TDS directly from the faucet, this method may cause errors. The correct measurement method is:disconnect the pressure barrel from the rear, and let the machine maintain the normal water production state for about 10 minutes (the time for the newly installed machine to be discharged will be extended by about one hour), and then take water from the pure water outlet of the reverse osmosis membrane shell. Detection. TDS testing pen has become one of our commonly used water quality testing tools. Open the TDS pen probe cover, press the marked ON/OFF button, wait for the LCD screen to display, insert the TDS pen into the water to be measured, wait for the value to stabilize, press the marked HOLD button, take out the TDS pen to read the value Yes, after the test, wipe the TDS pen probe clean with dry paper.

2. Reasons leading the high product water TDS value

A) There is an infiltration process when the RO membrane is first watered. During this period, a small amount of residual substances in the production of membrane materials will be dissolved in the water and washed out. If a wet membrane is used, the preservative inside the membrane will also be dissolved in the water and washed out. , This process generally takes 1-2 hours, and the TDS, which is externally expressed as pure water, is gradually decreasing.

A small amount of carbon powder and inorganic minerals in the rear activated carbon will be washed out when the water is passed for the first time, resulting in a high TDS. The solution is to fill the pressure tank with water when the first water is made. Then turn on and off the pure water faucet several times to allow the pure water to flush out the impurities in the activated carbon filter element. This process takes about 1 hour.

At the same time, if reverse osmosis pure water filtration system product water cannot be lowered, the following aspects also need to be checked:

(1) First check the TDS value of the raw water, the general RO membrane desalination rate is 98-99.5%;

(2) If it is a newly replaced reverse osmosis membrane that needs to run for 20 minutes, then measure;

(3) Confirm whether the pure water storage time in the water storage bucket is too long;

(4) If the rear activated carbon is newly replaced, it also needs to be flushed;

(5) After eliminating the above reasons, can consider replacing the reverse osmosis membrane.

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