When I opened my pool in early April my CYA was at 55ppm. I have only used bleach to this point and a new CYA test today shows 30ppm. Can you help with the following?

Is it time to start using my trichlor tablets?

How much of a CYA increase can I expect per trichlor tablet?

The manual for my Taylor kit says “never put a trichlor tablet in the skimmer”, why is that?

My current levels are:

FC = 3.5
CC = 0.0
TC = 3.5
PH = 7.4
TA = 100
CH = 150
CYA = 30
SI = -0.35

Thanks to this forum, my water has never been clearer.