If your CYA sample didn't turn cloudy, then you have little or no CYA in the water. If you have only used cal-hypo, then you haven't added any CYA yet. You'll need some, about 40-50 ppm. Not only if your chlorine "keeps jumping up and down." All outdoor pools have to have some or you won't be able to keep chlorine in the pool especially on hot sunny days. You can either buy some and add it directly or use a stabilized form of chlorine for awhile that will add CYA and chlorine at the same time. The choice is yours. Both ways are just fine. If you decide to add it separately, it may be labeled as conditioner or stabilizer. Check the label; the ingredients should say cyanuric or isocyanuric acid. You'll need 2 lbs. You can put it in an old sock and hang it in front of a return jet and give it a squeeze once in awhile to help it dissolve faster. Remove the sock from in front of the jet when you add other chemicals through the skimmer, however.
If you decide to use a stabilized form of chlorine instead, you can either buy dichlor shock powder or trichlor pucks. I'd suggest the dichlor, though, as it will get the CYA in there faster. If you have access to a Sam's Club, you can buy their 24lb pack of 1# bags of 100% dichlor shock. Each bag will add about 7 ppm of chlorine, and about 6 ppm of stabilizer, per 10K gallons of water. (You won't need all the bags this year, but you can save it til next year.) Otherwise, order dichlor from Amazon:
Kem-Tek Dichlor 22 lbs
We do NOT recommend buying dichlor locally, otherwise, at least until you are an EXPERT reader of chemical labels. The chlorinating pool chemicals sold at Walmart, Kmart, Costco, and most other local stores are diluted blends, sometimes with copper and other products with bad side-effects.
(After your CYA gets to around 50, you'll want to quit using dichlor and switch to bleach so your CYA doesn't get too high.)
Don't worry about the hardness test for now. But, if you decide to continue using the cal-hypo instead of using dichlor, you'll want to monitor it to make sure it doesn't get too high which can cause cloudy water problems.
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