Views: 23 Author: Site Editor Publish Time: 2021-06-11 Origin: Site
General RO reverse osmosis pure equipment out of the water TDS ≤ 50 both for direct drinking water, you can drink raw. However, even if the installation of RO reverse osmosis equipment, TDS value is still high, it is suspected that the quality of RO reverse osmosis pure equipment, in general, the higher the conductivity, the higher the salt, the higher the TDS. the higher the TDS value, that the water contains more impurities. If the TDS is high water, indicating that the water impurities, the quality of pure water is low, can not meet the needs of the project.
TDS measurement method.
General end customers or distributors, used to directly from the faucet to test TDS, such a method may lead to errors. The correct measurement method is: the pressure barrel and the post disconnected, so that the machine to maintain normal water state about 10 minutes later (the newly installed machine to extend the water time to about an hour), from the reverse osmosis membrane shell of the pure water outlet to take water testing. Open the TDS pen probe cover, press the button marked ON / OFF, to be displayed on the LCD screen, the TDS pen into the water being tested, to be stable values, press the button marked HOLD, take out the TDS pen to read the value can be, after the test is completed, with dry paper will be TDS pen probe wipe clean.
The TDS measurement unit is mg/l, which indicates how many grams of dissolved solids are contained in 1 liter of water. It includes soluble salts such as calcium ions, magnesium ions, etc.; ionic organic matter such as ammonium acetate, sodium sulfate, etc.; and some heavy metal ions such as chromium, zinc, lead, copper, etc.
Causes affecting high TDS value.
1．RO membrane when the first time through the water there is a wetting process, during this period the membrane material production of a small amount of residual substances will be dissolved in the water washed out, if the use of wet membrane, membrane internal preservatives will also be dissolved in the water washed out, this process generally takes 1-2 hours, the external performance of pure water TDS in gradually reduced.
2．After a small amount of activated carbon carbon and inorganic minerals in the first pass water will be flushed out, resulting in high TDS, the solution is to create water in the first time, the pressure barrel full of water, and then repeatedly switch on and off the pure water faucet several times, so that the pure water in the activated carbon cartridge flushed clean impurities. This process is about 1 hour.
How to reduce tds in water：
In China, especially in the northern region of the water quality TDS value is generally high, the national municipal tap water is generally about 250, and some areas of tap water and rivers and lakes water TDS value up to five or six hundred, individual groundwater up to thousands. And if the source water quality TDS value is too high, it is recommended that the use of RO water purification equipment before adding a front for protection.
At the same time, the RO reverse osmosis water purification equipment for the TDS value does not come down, the following aspects also need to focus on checking.
(1) first check the raw water TDS value, the general RO membrane desalination rate of 90%.
(2) If the newly replaced reverse osmosis membrane needs to run for 20 minutes, and then measured.
(3) to confirm whether the storage of pure water in the storage tank is too long.
(4) such as the new replacement of the post-activated carbon also need to be flushed; (5) measuring the quality of pure water
(5) measurement of pure water quality, please measure from the reverse osmosis membrane pure water port.
(6) after excluding the above reasons, you can consider replacing the RO reverse osmosis membrane.