Sterling Water Systems uses several different filter cartridges in its ICT20 and ICT30 Salt Free Water Conditioner. These filters usually consisted of a combination; 10” 5 micron cotton spun, 10” GAC (Granular Activated Carbon) and a 10” canister with Polyphosphate beads.
The number and configuration of the filters depends on the water quality. In most cases, the filters were installed using one (1) 10” 5 micron sediment and one (1) 10” GAC (Granulated Activated Charcoal).
It’s recommended that your Sterling Water Filters are changed every six months for maximum conditioner protection. It’s possible however that the polyphosphate crystals will last up to a year before they need to be replaced.
If you find an empty plastic container inside your filter housing when you un-screw the housing, then it was likely a polyphosphate cartridge. Some systems had three filters instead of two, one of these being the polyphosphate canister.
To replace the cartridges you will need to turn off and de-pressurize the plumbing system by opening up a faucet after you turn off your water supply. If you’re lucky enough to have a by-pass installed for your Sterling Water Filters, then you can simply by-pass the filters without turning off your water supply. Once you have the water by-passed or turned off, then you will want to press the red button on top of the housing lid (If you have one). This bottom will release the pressure on the canister itself.
Use your housing wrench to un-screw the blue housing and while you’re at it take a few extra minutes and clean the inside of the housing with a water/bleach solution. Re-install the new cartridge filter and use a little silicone grease or Vaseline on the threads and O-ring. Screw the housing back on and just snug it up, do not over tighten it. It’s fairly common for people to over-tighten the housing which can actually stretch the O-ring and it will no longer seal, causing the canister to leak.
We offer all of these Sterling Water Filters replacement cartridges and they are an exact match and made for this application.