where is my CYA disappearing to?

[aylad]

If you're using 6% bleach, 1.5 gallons is only going to raise your Cl by 7.5 ppm, which isn't high enough to achieve effective shock levels even with 0 CYA. If you have 0 CYA, you're going to need 2.5 gallons to get up to 12 ppm, and if you have CYA of 30, you'll need 3 gallons. May be why you're having trouble with algae wanting to grow....

Janet

[KWBourn]

I also can not keep my cya levels up added 2 pounds in april to the filter, not back washing for one month with no reading in may. so i splurged on liquid cya 1 gal. $39.00 in june Had cya at 20. I could keep my cl in my pool. Now not reading any again after a algae bloom last weekend the last 25 of the 35 days over 100 degrees cant keep any cl. adding bleach at night and 4 more pounds of cya thru nylon on ladder. I dont have a test kit since my kit i bought thru Ben so i am going to 3 different stores, getting very frustrated but dont know where my cya is going . Can it evaporate out of the pool?

24 round 13500 gal

[Watermom]

Do yourself a favor and buy a good test kit. It will save you the aggravation of having to go to pool stores for testing and you'll get better more reliable readings to boot. The one we recommend is the Taylor K-2006 or 2006C (same kit, larger bottle of some reagents). If you buy it through the Amazon link in my signature, the Pool Forum makes a little money on the sale which helps us keep this form online. Only buy if the seller is Amato Industries, however. Some other sellers are substituting the K-2005 which you do NOT want. If Amato isn't listed, wait a day or two and try again. They seem to restock pretty quickly when they sell out.