I am sorry I never got notification that you responded. I think I posted the following but not under my account:
I cannot figure out if I have a chemical or plumbing problem or something else.
~16,500 gal Kidney Bean Vinyl Pool with new Hayward Pro Series S244T Sand Filter residing in the northeast using a Hayward CL200 In-line chlorinator with 3 in. Stabilized Chlorine Tablets Tri-Chlor.
I am always chasing my Calcium Hardness levels up and my CCL levels down. I was told that CH should not be fluctuating so much - unless you have leak.
I refill water about 3-4 in. every week. However, when its time to open pool, the water is filled to the top, which makes me think if there is a leak, it would be in the plumbing. In the past several years, the return and skimmer plumbing were redone, which leaves the main drain. I hear the only solution is to plug it and not use it, but since the water is retained in the pool throughout the winter, then maybe the "break" in the pipe is above water level (my pool equipment is about 8-10 ft higher than pool).
Before I assume a leak in main drain and plug, I want to see if there is something chemically wrong.
I keep a Google Sheet of my pool chemical readings. The last three readouts from LaMotte ColorQ Pro 7 2056 and what I did:
5/22/22: FCL 5.29, TCL 6.60, CCL 1.3, pH 7.4, Alk 68, CH 126, CYA 66 - set chlorinator to 4, added 10lbs Calcium Hardness Increaser
5/27/22: FCL 2.46, TCL 3.79, CCL 1.3, pH 7.5, Alk 88, CH 141, CYA 54 - Added 5 chlorine tablets; 10lbs Calcium Hardness Increaser; 3in water
5/28/22: FCL 2.20, TCL 2.50, CCL 0.3, pH 7.5, Alk 78, CH 182, CYA 50 - Added 4lbs of Baking Soda
6/03/22: FCL 1.52, TCL 3.67, CCL 2.2, pH 7.6, Alk 96, CH 150, CYA 54 - Added 4 chlorine tablets
I added 3 in. water at least one other time during this period including it raining, but I am lost cause its like this all season long. I spend so much money on CH Increaser and liquid pool shock (Sodium Hypochlorite 10-14%). My next step might be to add 2 gal of liquid shock and see where that gets me...thoughts?