The Everpure 300-05835 (CTOS-Q) is a 15" Qwik-Twist replacement cartridge for OptiPure QTI series foodservice filtration systems. It reduces sediment down to 0.5 micron and reduces chlorine taste and odor, and its IsoNet scale-inhibiting technology helps protect equipment against scale and corrosion. The Pentair 300-05835 is rated for up to 22,500 gallons at a 2.25 GPM service flow and is NSF/ANSI 42 certified, which makes it a common choice for ice machines, coffee brewers, and steamers.
Step-by-Step Replacement Guide
- Shut off the water supply to the system and relieve pressure by opening a nearby faucet or the equipment's dispense valve until flow stops. Place a bucket under the system to catch residual water, and make sure there is at least 3" of clearance below it for removing the cartridge.
- Rotate the old CTOS-Q cartridge a quarter turn to release it from the filter head, then pull it straight down and out.
- Inspect the filter head for debris or damage, and wipe the area clean so the new cartridge will seat properly.
- Align the new CTOS-Q cartridge with the filter head, push it up into place, and rotate it a quarter turn in the opposite direction until it locks.
- Turn the water supply back on slowly and check the cartridge and fittings closely for leaks.
- Run water through the system at full flow to flush trapped air and loose carbon fines before returning it to service, then note the install date.
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