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Purple is usually indicitative of copper in the water, usually caused by the etching of copper coming from the heat exchanger of your pool heater. I have spoken with manufacturers heater engineers and they tell me that high Cyanuric Acid levels will not cause damage to copper heat exchangers. Although, high Cyanuric Acid levels are not good in pool water and are still acidic in nature although it is a basic acid.
As a CPO pool service technician here in Tennessee we run into this problem from time to time and have discovered it is usually due to the build up of hydrochloric acid (i.e., excess chlorine) or the back flow of hydrochloric acid through the copper heat exchanger of the pool heater. Back flow happens when you turn off your pool pump and chlorinated acid flows backwards into the heater in high concentrations.
This can be remedied back have a qualified pool service professional plumb in-line a check-valve (or backflow preventer) between the pool sanitizer feeder system (i.e., chlorinator, salt cell, etc.) and the pool heater unit.
You can usually remove the purple stains with a treatment of ascorbic acid (Vitamin C, we recommend the brand 'Nautral Chemistry Stain Free'. It has worked the best in our area). After adding the ascorbic acid you follow it up with a metal sequestering agent (We use 'Natural Chemistry Metal Free' as to keep with the same system of treatment chemicals designed to work in tandem with one another). Before adding any of these chemicals though we add a small amount of a filter media to the filter to catch the metal as it passes through the filter (see your neighborhood pool shop to ask them about filter media products).
Let the pool run for 24 hrs before backwashing or washing filter cartridges. We are going though this problem now....not only the ring but patchs of purple on the liner walls and bottom....Our Aquabot's filter bag fills up with a clay like material..
I have shocked the pool three times in one day...tried Black and regular Algaecide...Metal out and it's still there....I scrubbed the ring with a Scotchbrite pad and it look ok for a day or two and the ring started back...
I just found some info on the web saying high levels of Cyanuric Acid can cause the problem....Will try draining 1/4 of the pool water and refilling each day until the CA level is down to proper levels....
Hope this helped a little... I have just opened my pool (May 2005) and have purple residue all over the steps, swimout, hot tub and pool walls. I had a copper problem last summer and currently have slightly high cyanuric acid (87). Pool has been opened and running constantly for 3 days, the purple seems to be getting better (I keep vaccuuming it out). Do you have any treatment ideas?
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