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Purple Cyanurate is most often seen in the spring at pool opening. Although it has been "noticed", cooler water (under 68 degrees Fahrenheit) helps this reaction more readily occur.
Purple or Copper Cyanurate is further made worse by the following water balance issues:
1. High pH - over 7.8
2. High Total Alkalinity (TA) - over 150 ppm
3. High Cyanuric Acid (stabilizer, conditioner) level over 100 ppm.
For this reason alone it is NEVER a good idea to add CYA or stabilizer unless the water has been properly tested & analyzed. CYA should NEVER be added unless the level is BELOW 30 ppm. At spring opening it is always a good idea to allow the water to circulate for at least 48 hours continuously with the return jets or fittings pointing to the bottom of the pool to create better overall circulation. Also keep in mind that when testing pool water, high CYA levels can & will produce an INACCURATE Total Alkalinity level. Proper testing, analysis & balancing is required to correctly adjust the TA and pH.
4. Copper present in the water - especially if over 0.5 ppm. Copper can come from a variety of sources: home piping, pool heater, certain algaecides & ionizing systems, etc.
When all of these factors come together, you will experience the staining that you see in the pictures. THIS IS NOT PINK SLIME!
Purple or Copper Cyanurate is caused when the Cyanuric Acid (chlorine stabilizer or conditioner) is allowed to become "high" or usually over 100 ppm and it then reacts with any copper that may present in the water.
Purple Cyanurate is a chemical/mineral imbalance problem. It is NOT an "organism" or algae problem.
Furthermore, it can appear that the staining is similar to "crystals". See the pictures below sent in from one of our customers.Purple Cyanurate "stains" cannot be easily scrubbed, scraped or removed. It must be chemically treated.