I use a product called Seaboard Slo Tab 8 in an inline feeder when I have to leave the pool unattended for a few days. The container says "stabilized trichlor" and "89% available chlorine" -- whatever that means. There is no mention of CYA as an ingredient anywhere. Does trichlor somehow break down into cyanuric acid?
My CYA level has dropped from 60 at the beginning of the season after I added some to 35-40 now. One pool store told me it was 100 in May and 'dontcha worry yer head off, li'l lady' without any comment at all about increasing my chlorine levels, though they did want me to add 42 pounds of calcium (to my vinyl pool). Sigh. I ordered a Blue Devil test kit and have been checking once a month, and it has apparently leveled out at 35-40 which was the reading last month as well.
If the Slo Tab 8 add CYA, would I not see an increase in stabilizer? Or is the increase small enough to be negated by backfilling and rain? The pH is holding steady at 7.5, TA is 110, FC ranges between 3 and 5, CC has always been 0.
I clearly do not have a handle on how trichlor affects my water other than the water is clean, soft, sparkling and the bottom never feels slick.