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"Purple Cyanurate" - Copper Cyanurate

What it is & what it looks like: Watch the video

Purple cyanurate staining in filter, ParPools.comPurple or Copper Cyanurate is caused when the Cyanuric Acid (chlorine stabilizer or conditioner) is allowed to become "high" or 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 can not be easily scrubbed, scraped or removed. It must be

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!

Actual pictures of Purple (Copper) Cyanurate

Purple cyanurate stain on chlorine floater, purple cyanurate staining on garden hose,

For Pink Slime information please click here

Prevention of "Purple or Copper Cyanurate" is preferred over treatment. Follow these steps to prevent Purple Cyanurate:
1. Maintain proper water balance: pH 7.4 - 7.6, TA 80 - 140 ppm, Calcium hardness 175 - 250 ppm.
2. Only add stabilizer in Chlorine treated pools AND only when the CYA level drops below 20 - 30 ppm. If you are using a slow-dissolving type of chlorine tab or stick, those products will naturally release CYA into the pool over the course of the summer.
3. Only use copper based algaecides when treating severe algae problems.

Treatment of "Purple or Copper Cyanurate"
1. Reduce the CYA level to under 30 ppm by partially draining & refilling the pool with fresh water. After a partial drain & refill, allow the water to filter & circulate for 48 hours before testing.
2. Reduce the amount of copper present in the water.
3. Properly adjust the pH & TA
4. Adding an initial dose of Jack's Magic Blue or Pink Stuff has provided excellent & quicker treatment of the purple staining (we prefer Jack's Magic products because they do & will work in pools when the chlorine level is HIGH (between 3 ppm & 10 ppm).
4. Be patient! The Purple will eventually (sometimes as long as 4 to 6 weeks) to be re-absorbed into the water. There is NO quick fix.

*Follow the instructions given by your pool care specialist EXPLICITLY. Failure to do so could result in harm to you and/or your pool & its components.

If you still need help, here's how to reach us:

Telephone (during store hours): Shelton  203-377-0100


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