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Chlorine Is Too High - Problem?


my12by60

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We went on an 11-week RV trip this summer and returned in mid-October.  We had friends adding four of the 3-inch chlorine tablets into our in-deck chlorine dispenser each week.  They also checked the pH each week and added acid if needed.  The four tablets system has always worked well for us in prior years so we did not ask our friends to do chlorine testing for adjustment purposes.

This year when we returned and tested the chlorine it was hot pink in our K-2005 test kit.  For more precise information, I ordered the FAS-DPD kit from Amato to see just how high the chlorine is.  The test showed FC = 20 ppm and CC = 0.  The pH and TA readings are within normal ranges.

We live in the Phoenix area and our pool has no heater and a cartridge filter.  

Can I just let the chlorine level come down with time or is leaving the over-chlorinated water in the pool going to hurt something?

If we go away again next summer we will make sure to have our friends perform chlorine testing and adjust tablet additions as necessary.  We try to keep things as simple as possible for them.

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It's probably fine to let it come done on its own from exposure to the UV in sunlight. I assume you've got CYA in the water since you've been using pucks. CYA significantly moderates chlorine's strength.

Just note that continued use of Trichor tabs will increase the CYA level lowering chlorine's strength to the point where you can get algae growth. For every 10 ppm FC added by Trichlor, it also increases CYA by 6 ppm. To prevent algae growth regardless of nutrient (phosphate, nitrate) level, you'd need the FC to be at least 7.5% of the CYA level.

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Thanks for the reply. Yes, I am aware of the CYA issue with the pucks because I have been reading and learning on this site. I am glad to hear I can let UVs take care of the chlorine that is in the water.

I have been reading all of the info here and at TFP on The Liquidator. I am thinking of giving that a try to get away from the rising CYA problem by using liquid chlorine. I am not sure if The Liquidator will work with our equipment set up or not.

I think I will start another thread with questions on The Liquidator.

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