I also have the OTO kit. I have been using both and getting low on those reagents for the OTO. I'll check with the local pool supply to see if they read by the CYA drop method. I always take a sample in when first opening the pool but then never have to use them again for the season. Busted, they did sell me Algaecide when I was there in May, said to use it as maintenance. I cleaned the pool today and some of the yellow was back, just a small amount on some of the walls and a tad on the bottom. Then we got a big "ol" thunderstorm (I think small tornado) as pool water looked like the ocean churning at sea....lol....my pretty pool looked like rice soup from all the Leyland Cypress tress we have lining the back side of the property .... had to get the leaf rake and skim for hours it seemed.....lol. I still have about 31 pucks left, but I'll use them in our little tub that we put our feet in before getting in the pool to make sure grass is off our feet, so no big waste there.
Thanks for all your help. I know once I get the other testers I'll be well on my way. I'm going to try the test w/well water in 5 gal bucket w/ 1/4 cup chlorine to see if it turns in case of possible drain. Or if CYA is high, just maintain a higher FC until the end of the season. Again thanks so much
BTW... they're closed today for the Holiday....lol