Chlorine confusion

[Watermom]

Hi Greg and welcome to the Pool Forum. With a CYA of 80ppm, I wouldn't use any form of stabilized chlorine or else your CYA will continue to rise. You are already on the high side. Trichlor tabs and dichlor granules are both stabilized. I would suggest using either liquid pool store chlorine or just use plain, unscented household bleach which is what many of us on the forum use. Neither add CYA. Get the Taylor K-2006 and run a complete set of numbers and let someone here have a look.

Regarding pump run time --- typically 8-10 hours per day is adequate. You might do it in two 4 to 5 hour cycles.

I think your algae problems have more to do with high CYA and low chlorine levels than your pump run time. With high CYA, you need more chlorine. Take a look at the Best Guess Chlorine Chart in my signature below for more info about that.

Again, welcome. Hope you enjoy the forum

[PoolDoc]

Hi Greg;

Your pump run time was fine -- given that you had a DE filter. However, because a DE filter will remove algal spores and early algal growth, it will tend to stall algae development longer if you run it 24/7. But, if you maintain an adequate chlorine levels, 8 hours of DE filter run time is plenty . . . with clear water. Just remember that whenever you're having problems, you need to switch to 24/7 run times.

You can not trust pool store testing, ESPECIALLY when it's based on strips. Strip based testing is NEVER trustworthy. Titration and color match testing may, or may not be trustworthy, depending on the store. But, since you don't know, you're right back at not being able to trust the stores!

Buy a cheap OTO/phenol red test kit from Walmart or wherever, but ALSO, if you can afford it, buy a K2006 FAS-DPD testing. Right now, to fix you up, we need to know your CYA (stabilizer) level.

Also, any time you are low on chlorine, and need to raise it quickly, just add plain unscented 6% bleach. Assuming a 25' round with 48" water depth at ~13,500 gallons, one gallon of 6% bleach will add about 4 ppm of chlorine to your pool.

The trichlor from Sams is perfectly fine -- your dealer is either ignorant or dishonest. The dichlor at Sams is also fine, and unlike most pool store dichlor is both very cheap (below wholesale) and un-diluted. But, we need to know your CYA level, before you go get a bunch of chlorine with stabilizer in it.

If you can, get a K2006, and test your CYA. You can use the Amazon order link in my signature, if you like. If you can't afford one (~$70 for the 3/4 oz size or ~$110 for the 2oz size) take your water samples to several different stores, and see if you can find a store that will test your CYA with something besides a test strip.

By the way, with bleach, a DE filter like you have, and our instructions, you should be able to clean up any algae problems in a week or less!

[aylad]

Just a side note--before buying trichlor tabs from Sam's, check the ingredient label and make sure that it does not list any form of copper in the ingredients. The trichlor tabs at WalMart DO contain copper, so it wouldn't surprise me to find it in Sam's tabs, either. If you find copper listed as an ingredient, look elsewhere for your tabs--not because the chlorine is any different, but because you don't want to introduce copper into your pool. That's what causes green staining of liners, hair, and fingernails!

Janet

[PoolDoc]

Thanks Janet!

I'm so sick of trying to keep with all the ways Arch and Biolab/Chemtura keep screwing around with the basic chemicals to try to jack up the price and mess up the pool chemistry!

[aylad]

I'm so sick of trying to keep with all the ways Arch and Biolab/Chemtura keep screwing around with the basic chemicals to try to jack up the price and mess up the pool chemistry!

All the better to confuse you with, my dear!!!!

Life would be SO much easier if you could just buy "chlorine" without having to worry about "what kind"!!!

Janet

[waterbear]

All the better to confuse you with, my dear!!!!

Life would be SO much easier if you could just buy "chlorine" without having to worry about "what kind"!!!

Janet

Another reason to use bleach!

[PoolDoc]

Interestingly, I've recently discovered that MANY pool stores tell users that "bleach is only 3% chlorine", so the games don't end there!