Cartridge Set with Membrane for the Watts TGI 525

Replacement water filter cartridges and membrane for the Watts TGI 525 residential RO system.

We recommend that you change the carbon block, pleated and inline water filter cartridges every 12 months and the membrane every 24 months.

1st stage: 5 micron pleated cartridge (2.5 x 10'')

2nd stage: 5 micron carbon block cartridge (2.5 x 10'')

3rd stage: 5 micron carbon block cartridge (2.5 x 10'')

4th stage: Watts W-1812-50 50gpd membrane. A thin film composite RO membrane for residential RO systems. (1.8'' x 11.8'')

5th stage: 1 micron inline carbon block cartridge

Cartridge details for the Carbon Block:

• Watts F109009 coconut shell carbon block filter cartridge for chlorine, taste and odour reduction in water.*
• 2.5 x 10".
• 5 micron - up to 99% chlorine removal.
• Chlorine reduction >4,000 gallons @ 1.0gpm or 12 months; whichever comes first.
• Thick wall carbon construction for superior performance.
• Outperforms granulated activated carbon (GAC) cartridges as it has superior chlorine reduction, lower pressure drop and will not channel.
• Media wrap between centre tube and carbon block to reduce carbon fibres.
• Maximum operating pressure - 125psi.
• Operating temperature - 50°F to 125°F / 10°C to 52°C.
• Tested and certified NSF/ANSI standard 42 for materials only.
• FDA grade components and materials.
• Tested and verified by independent laboratory testing.

* On some occasions a CTO 2510-05 cartridge (or similar) may be supplied. 

Why do I need to change the o-ring?

You can tell if the seals start leaking, which is obvious, I know.

Even if there are no leaks you may find that the profile of the O ring becomes flattened because of prolonged time under compression. The cross section should be round and if it's not it may not seal easily.

However, we recommend that you replace the O rings every two or three years as a precautionary measure.

One of the main reasons for changing O rings periodically is that as they age and compress, the housing bowl needs to be tightened excessively. That leads to difficulty loosening the bowl from the cap next time the cartridge needs to be replaced.