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I'm not crazy about a pH of 7.8. It's easier on the eyes, but makes it harder for the chlorine to do its job. You can use either Muriatic acid or powdered acid (called Dry Acid or Low'n'Slow" to lower it. Use LESS than they recommend--it's always easier to add more of a chemical than compensate for too much.
Go to either Taylortechnologies.com or Leslies on-line and order either the K-2006C test kit from Taylor or the Leslies FAS-DPD Service Test Kit. Both are essentially the same kits, both use Taylor brand chemicals.
The FAS-DPD chlorine test is NOT the same as the DPD chlorine test. FAS-DPD measures FC (free chlorine--the good stuff) up to 50ppm, and also measures CC(combined chloramines--the used up stuff) to the same. FC + CC = TC (Total Chlorine) which is what your kit measures.
But either test kit will become your BEST FRIEND when it comes to maintaining your pool. The $60-$80 will be the best $$$ you spend on it, too.
Test Chlorine and pH everyday (your little kit is fine unless chlorine goes higher than it measures) and once a week run all the tests in the FAS-DPD kit--AND WRITE DOWN YOUR MEASUREMENTS! I used to do it in a hand-held PDA spreadsheet--then I got lazy after several years and just write it down all season. Record the date and water temp as well.
As WaterMom said, read a lot here. You'll learn about B-B-B for chemicals (Bleach, Borax and Baking Soda) and what the chems are the previous owner left.
Read the stickied sections first.
Then go to www.PoolSolutions.com and read everything you can get to. It's the sister site to this one.
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