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CarbonDoser® Precision Check Valve "Corrosion Resistant" (4 psi CRP)
Maintenance: Even though these checkvalves are highly resistant to corrosion, they still need regular cleaning due to mineral deposits that accumulate and cause the checkball to stick partially open.
If the unit sticks open, water (or even worse, saltwater) will backflow in to the regulator causing damage.
How to clean: Unscrew the 2 halves (carefully with 2 pairs of pliers being careful not to crush). As you disassemble the unit, take note of where the pieces go. Soak all of the pieces in CLR to dissolve the mineral deposits. Ensure all pieces are clean then rinse and reassemble.
How to Test: To perform a leak test, simply reverse the checkvalve, set the regulator on 12 lbs, run it in a cup of water (while reversed) and watch for bubbles.