This post will discuss the monthly maintenance tasks that should be performed on purclean reverse osmosis units.
Change the Pre-filter
- With the unit off, open the sample tap ball valve on the bottom of the stabilizer housing assembly to relieve any water pressure. Use the filter wrench provided and thread the filter housing cannister counter clockwise off its base.
- Remove the old filter and throw it away. Be careful not to lose the o-ring that is in the upper groove of the filter housing cannister. Flush out or clean the inside of the filter housing. Add approximately 4” of water to cause the filter to “float” in the housing.
- Insert a new filter and tighten by hand. Use the filter wrench to tighten to the base a bit if a leak is detected. Be sure that the o-ring is intact and properly seated on the filter housing.
Clean the Stabilizer
- With the RO unit off, open the sample tap ball valve on the bottom of the stabilizer housing assembly to relieve any water pressure. Unscrew the union housing the stabilizer and remove the stabilizer bar from the housing. Wire brush the bar. If it remains dull or stained proceed to the next step.
- Submerse the stabilizer in a small container containing muriatic acid (pool acid) for about 30-60 seconds. This will dissolve any mineral deposit on the inside and outside surfaces of the stabilizer. Remove from the acid and rinse off.
- Replace the stabilizer in the union housing with the hole facing up on the stabilizer and tighten the union.
- Restart the RO unit and inspect for leaks.
Safety Note: Follow all safety precautions noted on the muriatic acid bottle label. Wear or use proper personal protective equipment at all times when handling this product.
Check the Chlorine Levels (After the RO System has run at least 10 Min)
- Obtain a water sample from the sample tap on the bottom of the stabilizer housing.
- Perform a residual chlorine test for “total chlorine” on the water sample. The test must be able to measure both chlorine and chloramines.
- The result of the test should show 0ppm residual chlorine in the water sample. If chlorine is present, the carbon in the carbon tank will need to be replaced as soon as possible.
- A chlorine test should also be done on the incoming source water line before the carbon tank in order to determine how much chlorine is entering the unit. Most municipalities maintain a chlorine level of 1ppm or less. The standard carbon tank is sized for this level
and the carbon will normally require replacement in 12-18 months. If the chlorine level in the city water is higher then 1ppm, the carbon will be expended sooner. There may be a need to install a larger carbon filter if the levels are higher then 1ppm to ensure protection of the membrane. Contact PurClean technical support for a recommendation.