Thanks for the reply atlas,
Unfortunately I can not provide the model number of my pump & filter till I get home from work. I do know that both are made by Hayward & the filter is a sand filter. Also when I get off I'm going to go to Walmart to try to find the 6 way HTH tester & order the K-2006. The only thing I have for testing are the HTH test strips. I have added most recently is 3 , 1 pond bags of HTH super shock & swim, 2 bottles of HTC algaecide & 2 gallons of liquid chlorine procured from ACE. The pool is 4.5 feet deep that holds 15500 gallons I believe. When testing after adding chlorine it seemed that my cya was around 7.2 but was using the strips. I'm also trying to figure which is a better deal between the bleach & liquid chlorine. I believe I can get a case of the chlorine 12% somewhere between $11 & $14 for 4 gallon jugs.