100,000 gal pool

[4dks1]

For #1-CYA 140
For #2-What you said is correct.
For #3-I'll try that.

Here are the other results:
CYA 140
pH 7.5
FC .4ppm
CC .4ppm
TA 120ppm
CH 500

We've been adding the bleach.

Thank you.

[PoolDoc]

OK.

1. Definitely read http://pool9.net/cl-cya/; you will need much higher levels of chlorine than what you hve.

2. Tell me what sort of filter you have -- make/model. You're going to need to use either cal hypo or bleach to chlorinate. But you'll end up hauling a lot of bleach if you use that. You can use cal hypo IF you have a sand filter. It *MAY* be possible with other filters, but I haven't personally tested that, so you'll have to do so VERY carefully if you try that.

3. Check on your options for purchasing bleach. Can you buy 12 - 15% commercial bleach (aka 'liquid chlorine') in 2 - 5 gallon containers?

[4dks1]

DE filter Pentair Fns plus

Bought 12% Liquid chlorine & added 8 gals. Will look for 2-5 gal containers.

[PoolDoc]

See if you can buy -- and transport -- 100# containers of cal hypo locally. You're looking for prices of $2.75/lb or less.

You could also see what it will cost to have Leslies or one of the other online consumer chemical companies deliver it to you.

But . . . you'll need to comfortable monitoring your chemistry with a K2006 to pursue this. I've successfully used cal hypo on multiple occasions in large commercial pools, without having problems with calcium build up or pH. But it will be an off-label application method.

Also, you will have to be able to periodically backwash, or else open and wash out, your filter to use this method.

[4dks1]

I was able to find cal hypo. Questions before I use it.

Pool still green & not clear. Also found small possum in skimmer outlet. If I understand correctly we don't want to use dichlor right now to keep it balanced, that's why we need cal hypo?

We're using 12% liquid chlorine, but the cal hypo will clear it faster?

Using the Barracuda is not harmful is it?

Thank you.

[PoolDoc]

1. Your CYA is VERY high, so you don't want to add more. That fact rules out use of trichlor (pucks) and dichlor (granules).

2. Cal hypo can help the water clear faster, with sand filters. It's not going to help as much with a DE filter, unless you are trying to remove metals. But it can still be used OK.

3. Use up your bleach, first. It's perishable. You want to reach FC levels of 20 ppm or HIGHER.

4. Cal hypo needs to be added DIRECTLY to the skimmer, but FIRST you have to make sure there are no devices or feeders ANYWHERE between the skimmer and the filter. Cal hypo and dichlor / trichlor react badly if they come into direct contact with each other.

5. Once you began using cal hypo, you need to let your pH 'float' unless the level exceeds 8.0. If you add via the skimmer, and let the pH float, your TA and CH levels will not get too high. If you add cal hypo directly to the pool OR try to adjust the pH down, your TA and CH levels WILL get too high, from the cal hypo.

6. Please complete the form here: http://pool9.net/pf-chart/ with the most current info you have on your pool's dimensions and equipment.

[4dks1]

The pressure seems to rise quickly resulting in lots of backwashing. Is that normal when you're trying to get clear pool water?


FC .2
CC 1.2
pH 7.4
TA 150
CH 300
CYA unable to determine

++after grid & manifold replacements. 25lbs of Cal hypo added.
DE filter