how does this happen

[Makdaddy]

last weekend pool looked great
Yesterday lifted the solar cover to check temp
brown and green stripes ?????
Salt water gen is working.
Free Chlorine tested at 14 and Cc test was clear showed none????
So pool cleaner is cleaning it up and im debating about a shock.
We did have a day of rain last week, But would that do it??
As the cleaner is plowing through the mess its puffing up green.

How can the CC test and 14 PPm on chlorine allow this to happen?

 

[YippeeSkippy]

Did the pool go a week without testing and lifting the cover to let the water "breath" and let the sun burn off some CCs?

Maddie

 

[Makdaddy]

correct we keep the cover on all week inbetween swims on the weekend
The pool had a FC of 14 and No CC on the test, it was clear.
here are my numbers
FC 14
PH 7.6
CYA 80

Salt was 2750
SWG runs 10 hours from 1Pm till done

 

[kimkats]

I am going to guess you have some "dead" areas as far as water flow. That would allow algae to take hold as the chlorine water is not reaching it do to flow issues in that area.

 

[setsailsoon]

What test kit are you using?

 

[Makdaddy]

TFT

What test kit are you using?

TFT

Water circulation hasent changed in 8 years that I have had the pool? But Ill redirect the water flow and see what happens,,Also Pump runs on low 24/7
struggling with why the TFT kit shows zero CC yet I see the green poofs when i brush it.

 

[setsailsoon]

CC level depends on a number of factors including how quickly the chlorine completely oxidizes the organics There are many different forms of organics some get directly oxidized completely others go through multiple steps. Often (maybe even usually) CC's do go up but not always the same amount. That's probably why there are more than one criteria for a SLAM. If you have visible algae you need to SLAM.

No idea why this just happened now. Have you changed pump speed or held it constant over the 8 years. How about your brushing? Salt generator output changes... it's hard for all the things that can affect this to stay absolutely constant.

Chris

 

[Makdaddy]

Really no changes. Slam got it under control. I was returning water away from skimmer but I n the surface. Now I'm directing the water to the floor.

 

[DorsalSpine]

It could be the water flow. It could be your solar cover. I know I had to keep an eye on mine when we would have little rains. The water laying on the cover would turn into an algae/bird bath/dirt trap. If it stayed wet enough the algae kept growing on top of the cover until a hard rain would wash it into the pool.

 

[kellyfair]

I’ve been SLAMming since Sat. I haven’t yet had even 0.5 CC, even with visible algae.

 

[gregsfc]

Like it has been stated already, that's why we have more than one criterion to SLAM. I once had zero cc's shown on the TF-100 FAS-DPD test and a clear pool, but suddenly started losing an exta 3 ppm fc per day. I started SLAM and continued until I passed OCLT. My pool has been fine since. I never figured out what happened. Sometimes, we can't find the cause, but we usually always have the easy and right answer thanks to TFP. If I had been following the traditional method back then, I would have ended up with a swamp, because I would not have been so in tune to something going on with my pool sans the TFPC methodologies and running with no fc.

 

[goody222]

I've done 5 or 6 SLAMs. Always had clear water with 0 CCs. The overnight test was what got me every time.

 

[gregsfc]

I've done 5 or 6 SLAMs. Always had clear water with 0 CCs. The overnight test was what got me every time.

And if you're following anyone else's method that I know of, you'll never catch this problem, and that'll cost a pool owner in the end. Time, effort, money and ego.