We got a new liner this year (so brand new poolful of virgin water) and we had a LOT of trichlor tablets (yah- the old hockey pucks we all hate). Anyway, instead of adding a lot of stabalizer and then using bleach and wasting the trichlor, we just kept using trichlor until the CYA came up to 50 and adjusting the pH along the way with Borax (saves the whole borax-acid-borax-acid game). It took a while, but now our CYA is at 50 and we're using good ole bleach now. So what to do with those trichlor tabs- TOILET BOWL CLEANER! Dropped one in each toilet tank and it's GREAT!
Seems to do the job well and when you flush, you can smell the bleach in it. I guess with the CYA in it, it may help with those iron/scale/hard water marks over time. I guess time will tell if it's etching out too much. Any thoughts out there??