DIY Fix for RO Water Purifier Pump Leaks

After many years of use, the booster pump of a 75G RO (reverse osmosis) water purifier has leaked several times. So how should this kind of situation be handled? If you are interested, keep reading.

The most straightforward solution is to replace it with a new one. You can switch to a ROSWAN 400G water purifier and reuse the original pressure tank, but you will need to prepare two adapters yourself. The inlet and outlet of this unit are both 3/8-inch, and there is no dedicated port for a pressure tank. You can simply prepare a tee connector to connect the purified water line to the pressure tank. The original pressure tank uses a 1/4-inch connection, so you will need a T-shaped tee with 3/8-inch on both ends and 1/4-inch in the middle.

If there is no pressure tank, the TDS of the first water drawn can reach around 90, and you need to flush it for about two minutes before it gets close to normal. Tap water is around 150. Filling a 5-liter bottle takes about four minutes.

However, after installing the tee, cutting the purified water line, and adding the tee and the pressure tank, the TDS drops to around 5 as soon as you draw water, and filling a 7-liter bottle only takes two minutes. For tankless pure water machines, simply adding a tank can solve basically all the problems.

The actual setup with the pressure tank is shown in the image below.

The schematic diagram is shown in the image below.

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