Stabilizer ?

[hannadock]

I found it at waterwarehouse online with next day delivery. Thanks

[hannadock]

My water is still not crystal clear. My readings are in range. It's been almost 3 weeks now. I have put more than 40 bottles of 182oz of bleach in my pool. I have been backwashing, scrubbing and vaccumming till my back hurts. Should it take this long. My pool is 20X40 inground and around 56000 gallons.

[AnnaK]

I'm a little confused by your pool volume. In an earlier post you said it's 36,000 but now you say it's 56,000. Maybe a typo? Given the dimensions of 20x40 and averaging a depth of 5' we'd be looking at +/- 36,000.

Would you please post your test numbers?

FC, CC, TA, CH, CYA, pH, and please describe what you use for water testing.

It sounds like you've been doing everything right as far as brushing, backwashing, filtering and treating the water. Knowing the FC and CC readings would help us try to understand what's going on. If the water is still cloudy we might be looking at issues unrelated to algae.

[hannadock]

I must have made a typo it is 56000 if calculator is correct. 20X40 with 8.5 deep end.

I use a Aqua Chem test kit and another by Bio-Labs.

My CYA is around 70
My FC is 5.0
My TC is 11 or 16 unsure how you calculate this
My PH is near 7.6
My TA is 140

I added 2 bottles bleach late last night. I just added soda this morning and Polyquat 60 tonight. Should I use Floc to settle this stuff down?

[polyvue]

I must have made a typo it is 56000 if calculator is correct. 20X40 with 8.5 deep end.

If your pool is "typical" -- 3.5 feet shallow end, 8.5' deep end... the average depth is close to 6 feet.

20 x 40 (rectangle) x 6 (avg. depth) x 7.48 (gallons in cubic sq ft) = 35, 900 gallons

It appears Total Alkalinity (TA) went from too low to too high. You may be trying to do too many things at once. Do you have a test result for Calcium Hardness (CH)?

With a CYA of 70 ppm, you must maintain AT LEAST 20 PPM Free Chlorine (FC) to continue shocking...

See http://www.poolforum.com/pf2/showthread.php?t=365

[hannadock]

Do I need calcium for vinyl?

[Watermom]

No. Don't worry about the calcium for a vinyl pool.

[polyvue]

Do I need calcium for vinyl?

No. If you know there's no calcium in the water, you could just indicate CH=0.

Had just thought you'd forgotten to post it.

Although it feels like you've been adding chlorine all your life... if the Free Chlorine (FC) drops by more than 1 PPM or so overnight, it's not over. The Total Chlorine (TC) -- whichever number is correct -- means that there is quite a lot of Combined Chlorine (CC).... an indication that your efforts are working, but quite slowly.

It will take about 8 gallons -- (or 12 96 oz. jugs) of 6% bleach to bring 36K gallons of water from 5 to 20 PPM FC. And you'll likely need more tomrrow morning to bring it back up to 20 PPM.

[AnnaK]

My TC is 11 or 16 unsure how you calculate this

Total Chlorine = Free Chlorine + Combined Chlorine

An FAS-DPD type test kit can measure FC at concentrations far above 5 ppm which is the value at which most other tests quit. A TC of 11 (or 16) means your CC is 7 (or 11) which is an indicator that the chlorine you're adding is working on something in your water. I am not familiar with the test kits you use, don't know their range, and am somewhat concerned that your numbers may not be accurate.

In my opinion, there's little sense at throwing a flocculant at the water until the FC holds steady but without being able to test for the high concentration of FC needed for the amount of CYA we're all just sort of working in the dark, guessing at why your water remains cloudy.

This thread started with TA "around 30". How did it get to 140?
You added 3.75 pounds of stabilizer which would have increased CYA by ~ 12 ppm. How did it get to 70 ?

I'm having a problem with the testing and the numbers.