I have my first problem with my chemistry. I ordered the test kit a few weeks ago, but haven't received it, so I'm still relying on an old kit and pool store tests. Here are the last 4 pool store test results from their drop kit:

6/5
FC 0
CYA 0
ph 6.8
Alk 120
Salt 3000
TDS otc

5/27
FC .1
CYA 80
ph 7.4
Alk 110
Salt 3000
TDS otc

5/9
FC .2
CYA 80
ph 7.5
Alk 100
Salt 4000
TDS otc

5/4
FC .2
CYA 80
ph 7.6
Alk 100
Salt 0
TDS 1250

* otc = off the chart

I think my salt generator is failing so I loaded my skimmer with 4 pucks before going away for 4 days. I came back to my cover being loaded with algae filled water due to rain and 90+ degree temperatures. Drained the cover and opened to find blue cloudy water. I have poured in 5 gallons of bleach and kept a couple of pucks in the floater for the last 36 hours. I backwashed my filter and vacuumed to waste yesterday. Doing that drained a couple of inches, so I refilled with city water.

What caused my CYA to disappear? How do I get my water back to normal?

Greg