Pool Cloudy, Chemicals Seem Good

[NorthPilot06]

Good morning y'all, been dealing with a stubborn cloudy pool for a while now. Only problem is that we seem to be doing things right, at least imo. Here are the current test results from the T-2006.

pH: 7.5
FC: 7.5 (I had bumped it up a while back when the pool was cloudy w/ shock)
CC: <0.5
TA: 50
CH: 110
NaCl: 3100
CYA: 45

I've had it sitting in this sweet spot for our vinyl liner pool for a while now, but no matter how many days I keep running the filter and vacuuming/backwashing/cleaning filter baskets, the pool is continuously cloudy.

I put some clarifier in the pool two days ago to try to accumulate the particles to no avail. Starting to run out of options - any ideas?

 

[mknauss]

Do a Overnight Chlorine Loss Test. Be sure the SWCG is off during the test.

A cloudy pool invariably needs to follow the SLAM Process

 

[NorthPilot06]

Sorry, I should have mentioned that a OCLT results in less than a 0.5ppm drop in FC.

 

[mknauss]

A cloudy pool invariably needs to follow the SLAM Process

 

[mknauss]

If you are absolutely convinced you have no organics in your pool, then try Add DE to a Sand Filter - Trouble Free Pool
Be sure you have time to baby sit the filter as it should need backwashing fairly quickly.

Also, when was the last time you deep cleaned the sand in the filter? I see you used clarifier, do you do that often?

 

[NorthPilot06]

This is the first time that I've used clarifier in the pool - and I replaced the sand media in ~August 2019.

 

[NorthPilot06]

I saw another post recommending adding DE to the sand filter, that's an interesting idea. Certainly haven't done that before.

Is it correct to assume that any added DE would get washed out with backwashing (and would therefore have to be re-added)?

 

[mknauss]

OK -- then try the DE.

If you ever really want to use clarifier, which we do not recommend, please get quality product. SeaKlear or Orenda. It is not cheap.

 

[mknauss]

Is it correct to assume that any added DE would get washed out with backwashing (and would therefore have to be re-added)?

Yes -- thus the baby sit comment. You add enough DE to get a 1 psi rise above clean filter pressure. Filter until your pressure rises by 25% over clean pressure, backwash, rinse, repeat. Might do it many times during a single day.

 

[NorthPilot06]

Sounds good, I'll pick some up on my way home and give it a shot. Thanks for the recommendation!

 

[mknauss]

Sounds good, I'll pick some up on my way home and give it a shot. Thanks for the recommendation!

Great. Be sure it is pool DE. Garden DE does not work------

 

[NorthPilot06]

Yup, will do. Thanks!