California Faucets Thermostatic Cartridge - Manual (Page 2)

Use a small funnel and slowly pour vinegar into shower
arm until it overflows.
If the shower arm is a ceiling nipple place, flexible tube
into ceiling nipple tape in place with duct tape and
attach other end to pump with bottle and pump vinegar
to fill piping and valve body.
Allow vinegar to soak for 60 minutes. Drain vinegar by
removing cartridge head. Repeat this procedure at
least twice. Depending on the amount of calcium build
up in the body and around the cartridge, this rinse may
have to be repeated multiple times.
After the final vinegar soak procedure, remove the
cartridge head, to drain vinegar in cartridge. Clean and
dry the male threads on cartridge head and female
threads on stuck housing. Apply High Strength Loctite
or thread locker to both threads and snuggly tighten
cartridge head using a crescent wrench. Allow adhesive
to cure for at least 6 hours minimum before tying to
unscrew stuck cartridge. This is an important waiting
period, if too much build up remains and not enough
time is allowed for adhesive cure cartridge head will
unscrew from cartridge housing again.
Remove the cartridge, and drain out all the
vinegar from the valve body and pipes.
Inspect the inside of the body and clean any
calcium and mineral build up with a stiff nylon
bristle bottlebrush and vinegar solution.