ok, the last two days of testing seem to indicate the chlorine levels have stabilized a bit. I think.

Two nights ago, the readings were

FC 11ppm
CC 5.5 ppm

I added bleach in the amount the pool calc said would get me to 15 but either my volume is off or I made a mistake in the form. The next evening (last night) the readings were:

FC 19ppm
CC 0

This morning I tested again and it was:

FC 15ppm
CC 1

Pool is still very cloudy. Doesn't seem to be improving much. Pump pressure does rise. I am using DE in addition to the sand. I'm wondering if at this point the filter needs the sand replaced or maybe is channelled. The pool sand was replaced 6 years ago.

Any ideas about what to do now?

Thanks