There are chlorine (cal-hypo) pucks without CYA, but YOU CANNOT USE THEM IN YOUR INLINE CHLORINATOR, EVEN IF YOU CLEAN IT WELL FIRST!!! You run a serious risk of explosion and injury if you try. The chlorinator you have is designed for trichlor, and trichlor only. And no, trichlor isn't available without CYA.

If it makes you feel any better, you're not the only one with this problem--it is a very common problem among people that trust their pool store to balance their water for them--but forget that pool store people make their money by selling you stuff to fix problems! Trichlor is not a bad thing, if you understand the chemistry behind it. If you have a pool with low CYA and a pH trending upward, trichlor pucks are exactly what you need to fix it. HOwever, if your CYAis already that high, use of the trichlor will only drive it higher, requiring you to use more and more chlorine as a maintanance level, as Watermom said. If you want to continue to use the chlorinator, I suggest that you drain/refill a large enough quantity of water (not all at the same time unless you use the sheet method) to get your CYA back down to20-30 or so, and then set your chlorinator at the lowest setting. Toward the end of the summer you may find yourself having to supplement with bleach, but that's one of the caveats of trichlor.

Janet