Chlorine levels unstable

[justojake]

Could someone please help?
Opened AGP Saturday to green algae mess.
Bleached the @#$% out of water and by Sunday it was clear, however, chlorine levels will not stay up. Added 3 gallons this morning, waited hour and checked at 10.5 ppm. (TF100) Checked 2 hrs later, .5ppm?!?!?!

16X32 with 6 ft hopper

Here are latest readings
PH-7.8
FC-.5
CC-.5
TC-1
CH-120
CYA- <20- at top of cylinder. water still clear enough to see black dot.

Again, water in pool is still very clear and it is obvious there is some level of chlorine. Am I worrying too much?

 

[JasonLion]

You need to raise the CYA level or you lose all of your chlorine to sunlight.

 

[duraleigh]

Chlorine is a consumable item. It must be constantly replenished. Yours is getting consumed very fast for one (or both) of two reasons...

1. You have no CYA in your pool

2. You have organics (algae) in your pool.

read "The ABC's of Pool Water Chemistry" up in Pool School.....that'll help you understand both things better.

 

[timerguy]

I'll vote for both!