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In the previous DIY article, DIY Fix for RO Water Purifier Pump Leaks, we talked about one type of water purifier modification. In this article, we'll cover another kind of purifier upgrade.

The 75G water purifier being modified this time is from the PUREKON brand.

This old 50G reverse osmosis (RO) water purifier had sealing issues in the booster pump after long-term use, so you can choose to replace it with a 400G pump and see how it works.

If you buy the RO membrane and housing as a full set, it can be quite expensive. A more cost-effective option is to prepare one membrane housing, three fittings, one check valve, and one wrench. However, note that if the housing kit does not come with a wastewater flow restrictor and instead uses a check valve, you will also need to prepare an additional 1500cc flow restrictor. If you feel that's a bit too large in actual use, a 1000cc one will also work.

In addition, you'll need a 24V 4A power supply, as well as several 1/4-inch and 3/8-inch tubes.

Once everything is ready, you can start the installation. If the new membrane housing is much larger than the original one and the frame is a bit small, the setup may feel somewhat cramped. Be careful when installing the fittings and tubing—poor installation can lead to various leakage issues.

If the RO membrane is not connected to activated carbon, the TDS value may not change much when you first power it on. Also, stored water in activated carbon may have a risk of contamination, so a T33 post-carbon filter is needed, mainly to reduce potential pollution.

The actual setup is shown in the image below.

The image below shows that because the wastewater flow ratio was too large and produced too much wastewater, an additional valve was added to the wastewater line and adjusted to a 1:1 ratio. This component is actually a pneumatic part.

For the power supply, you can solder a DC jack. The unit will work as soon as the DC plug is connected, making it convenient and flexible.

Finished.