Your signature shows a "Taylor K2600 kit"?
Did you mean a Taylor K2006?
Is it the smaller K2006 or is it the K2006C?
Update your signature with correct information please.
Post a full set of current test results
FC
CC
pH (only accurate when FC is 10 or less)
TA
CH
CYA
Water temperature
Use the extended test kit instructions
www.troublefreepool.com
Take each test to its end point, no stopping after some arbitrary number of drops.
If you think you are starting to get low on testing reagents, order more now.
Does your DE filter have a MPV or push/pull backwash valve?
Follow the
SLAM Process to the letter. No shortcuts.