My husband and child wanted to swim over the weekend so we waited until 4:00 pm today to add the washing soda and BaquaShock. I tested before we added them.
fcl 3
tcl 5
ccl 2
alk 170
cya 30
ph 7.5


I tested again at 9:00 pm
fcl 1
tcl 1
ccl 0
alk 200
ph off the scale

Chem_geek and Waterbear said wait 24 hours and start adding chlorine, if it's 0 ccl, until it holds a fcl reading. Lower ph before adding chlorine or after? How much chlorine should I add at a time and how often? I have cal hypo and 3 inch tablets and bleach ( if the store doesn't run out again!).
Then clean filter thoroughly and change sand.
Again, thanks for the help! All of you guys are the best!