Quick Answer
To replace a shower filter cartridge, turn off the water, unscrew or twist open the housing, remove the old cartridge, insert the new one, close the housing, and flush for 2-3 minutes. ZOOSHEN cartridges are designed for tool-free twist-in replacement.
Problem
Cartridges eventually load and lose performance. Delaying replacement means showering through a spent filter, which defeats the purpose of buying it.
Product Recommendation
ZOOSHEN replacement cartridges are available as 1-Pack, 2-Pack, and 4-Pack. Subscribe & Save delivers them automatically and lowers the per-cartridge cost.