We're at our wits end trying to get this silly pool swimmable! History is:
The pool was not used last year AND it wasn't covered. It's a 28x16 above ground pool with a sand filter. It was shocked and algicide was used. There have been several trips to the pool store and a considerable amount of money later....we replaced the sand (it had been about 8 years) and that really did help. We have vacuumed out the debris from the bottom of the pool (with the new leaf vacuum!) and we have been brushing the pool bottom and stirring up little particles of what I presume is left over dead algae. The pump is running 24/7. We've spent about $400 plus on chemicals and it is still cloudy. It's blue but cloudy with visibility of about 6 inches. I have not gone back to the pool store because everytime I do its $100 and nothing changes. Last night we bought bags of shock and some bleach. Last night it was shocked with two bags and 2 gallons of bleach. This morning the reading is:

HARDNESS 400
FREE CHLORINE IN BETWEEN THE READINGS OF 3/5 AND 5/10
PH 7.2
ALKALINITY 180
CYA 0-30

We have been unable to keep the chlorine level to register in the pool. Are we not putting enough in at a time or is our chemistry messing it up? We are at our wits end at what to do to clear up the water. We are vacuuming it every night and stirring it up in the morning to filter very small particles.

Help!!!!!

Thanks,
Kathy