Test Results - Please Review

[PoolDoc]

Trucked in water didn't have CYA in it -- it's NEVER used in potable water treatment.

Stabilizer dissolves slowly, so what you added 4 days ago is only now fully dissolving. If you added granular stabilizer yesterday, you'll probably continue to see a rise in CYA levels over the next few days.

As a rule, a drop in filter pressure means a drop in flow, often because of a dirty strainer basket, or a clogged impeller. Is that a possibility on your pool?

[Jacob99]

How would it have climbed this high in the first place though? I definitely did not use enough stabilizer to get levels that high. I used 1 gallon of this:

http://www.intheswim.com/Pool-Chemic...r-Conditioner/

And 3 lbs of this:

http://www.walmart.com/ip/HTH-Stabil...Specifications

In a 23,900 gallon pool that should have given me around 30ppm or so....not 55.

[PoolDoc]

Partly, you're overestimating your gallons. Pool companies always quote volume at the 'running over the sides' level, not the actual level.

It's not really a problem, though, so I'm not inclined to put much effort into figuring out exactly how it happened.

[Jacob99]

LoL...I appreciate your honesty. So from a quick search here the rule of thumb is to keep FC at about 8% of the CYA?

[Watermom]

Take a look at the Best Guess Chlorine Chart below for the correlation between CYA and needed chlorine levels.

[PoolDoc]

So from a quick search here the rule of thumb is to keep FC at about 8% of the CYA?

That will work, most of the time. You can't kill established biofilms (slime, black algae, mustard algae) that way, however.

[Jacob99]

I tested my CYA again today. I think yesterday's results weren't accurate. After reading some more on this site, I guess the CYA should be tested on water at room temperature, but I tested with water immediately out of the pool which was only around 55 degrees. I got a new water sample first thing this morning and just tested it. I also tested outside for lighting purposes. Results today are between 35-40 which is right around my original target.

However, today my CC crept up from .4 to .8. My water is still pretty darn clear, but maybe I have the start of an algae growth? I haven't been able to brush my walls or vacuum my pool bottom due to the water temps. Pool was installed too early in the season!

FC: 2.6
CC: 0.8
pH: 7.2
TA: 60
CYA: 40ish

[Watermom]

Why can't you vacuum or brush? My water is still cool (haven't measured the temp) and I've been vacuuming for awhile now. Probably the first time was sometime at the end of March and I doubt my water was any warmer than 55 at that point.

By the way --- to save on your reagents, use the 10ml water sample instead of the 25ml sample. A testing margin of 0.5 is just fine and it isn't worth the extra reagents to get a 0.2 margin.

[Jacob99]

Why can't you vacuum or brush? My water is still cool (haven't measured the temp) and I've been vacuuming for awhile now. Probably the first time was sometime at the end of March and I doubt my water was any warmer than 55 at that point.

So you actually go into the water to vacuum and brush or you do this from outside the pool?

[Watermom]

I just vac from outside the pool manually or I throw one of my automatic cleaners in. I have a Wanda the Whale and also a Polaris 65. No way I'd go in water that is that cold!