So I'm a recent convert, as I've mentioned in a few other threads. I had been using MA for PH, and 3" trichlor tabs with Chlor-Brite for chlorine.
But I've gotten rid of the tabs and switched to liquid chlorine now, so I'm partly 'there'. I'll have to wait for the start of next season to jump on the TF-100 bandwagon, but I will. I use the basic Leslies DPD kit (FC and PH) for now.
Leslie's water tests have always shown me as having very high CYA (99 -- which is understandable due to all the trichlor -- I get that)... but it also has me as a fairly high 120 for TA. It's always been up there, for the last 1.5 seasons.
Any guesses as to why TA would be that high? Before finding this site, I didn't realize that water aeration caused PH to rise, and had the pool's waterfall on constantly, and thus was always adding MA to lower the PH levels. I've never had to raise PH since I've been here... its been constant MA additions and backwashes/refills/more MA.
Does Trichlor/Dichlor mess with TA? Just seems weird that it'd be that high, with all the acid I've been putting in over the last year. Basically, I've done everything pool school says to lower TA (without knowing I was doing it). But my test results have been steadily high.
I plan to dilute the pool water 50% and see if I get more manageable readings (since learning here that being that high tends to lead to less accurate results).
Oh -- and I know pool store testing is no substitute for a real kit... but they've been consistently the same for sooooo long. It's just weird.
Scary thing is -- I just drained about 20% of the pool the other night, refilled... brought to Leslies -- and my results as far as CYA and TA were the SAME as before the drain-refill.... so they must be off-the-charts bad if Leslie's is to be believed.