Pool cloudiness problem. HELP

[Froggypool]

I have a 30 ft AG pool, 20k gal.
hayward 1.5 hp pump with a 250 lb 18 inch sand filter

I have owned the pool for 4 summers and the past 2 have been using a modified BBB method( using shock and tablets instead of bleach). This year has been tough. It has been cloudy for 3 weeks and I can't seem to get it clear. It has been blue, but just cloudy. I had to add cya, baking soda, and some muratic acid too, but I can't seem to keep the chlorine level up. I ordered a taylor 2006 test kit that just arrived today. Before then i had been using a cheap test kit that wasn't very nearly as accurate and didnt measure cya, but it had managed to always work until late in the summer just before i closed it, it would get cloudy. From reading other posts on here, i think i should be keeping my chlorine levels up to 15 ppm for about a week and hopefully it will clear up, but i really dont know. The past 48 hours I have added 15 gallons of 8.25% bleach and have managed to get the chlorine up.

PLEASE HELP

FC = 10.6
CC = .8
Ph = 7.2
Alk = 160
CYA = 34
Calcium hardness = 70

THANKS!!!!

[PoolDoc]

Do the DE test on your filter:
http://pool9.net/de-test/

Given your numbers, etc. I'm guessing you've blown the sand out of the filter. If that turns out to be correct, after you open the filter and add more sand, you'll need to put a valve between the pump and the filter, so you can throttle the flow back some.

[PoolDoc]

You emailed me indicating you intended to change your sand. That is probably NOT needed; all the pool books notwithstanding, we have seen NO evidence that sand 'wears out'.

Instead, simply (a) make sure the filter is FULL of sand, to the correct level, and that (b) the flow is throttled back. You can test this by checking the backwash. If sand is coming out, the flow it too high. (There will be a little sand on the FIRST backwash, and that is normal.)

One point to check though: there is some bad or fake filter sand out there. Buy LABELED pool filter sand (but not Quikrete pool sand). Before you add, grab a sample from inside the filter and compare it to the bagged sand. If the sand in your filter is coarse compared to the filter sand, replace it to within 1 -2" of the laterals. But if they are both the same, just add more as needed.

[Froggypool]

I have already posted about this, but cannot find it in the forum. A moderator answered and said to check my sand level. I changed my sand yesterday, and it has been running about 13 hours with no visible change.

My pool has been cloudy for 3 weeks. Ever since I opened it. I have a 5 year old AG 30 ft (20,000 gal) pool with a 1.5 hp Hayward pump. I have a 250 lb 18 in. Sand filter. I have been using the BBB method for 2 years. This year I cannot get the cloudiness to go away. I have been trying to keep the chlorine level at 15 ppm for the last 4 days to kill algae. Here are my numbers, they have been running pretty consistent for the past week or 2.

As of this morning:

FC 10 (just added 7 ppm this morning to boost)
CC 0.5
TA 150
Ph 7.4
Calc hardness 70
CYA 55

[Pappy]

First, test your filter with D.E. Slowly add 1/2 cup of D.E. to the skimmer while watching the return. If you see white or cloudy stuff coming back through the returns, you may hve a filter problem.

If you don't see stuff coming back, read this thread. http://pool9.net/de-test/

You may be able to get D.E. @ WalMart http://www.walmart.com/ip/HTH-D.E-Fi...10-lb/20434370 Description is correct, PICTURE is WRONG.