White Sediment On Pool Bottom

by Rich
(Virgin Islands)

Pool is in Virgin Islands. Pool has been clear and stable.


My wife shocked the pool 3 weeks ago before returning to States. When I arrived, pool was super clear and nice with some leaves and things on the bottom.

When I started cleaning I noticed a rather heavy layer of fine white powder on the bottom. I backwashed the filter and a high volume of white cloudiness poured out.

When I started vacuuming, this fine white powder from the bottom came back into the pool via the jets. Any idea what has caused this problem? Could my wife have over-chlorinated (we use Trichlor powder)?

I will test for alkalinity and hardness.




Thanks for the question Rich

There are so many reasons for a cloudy pool, but this link will give you a good list:

Cloudy Pool Water..Algae Swimming Pool..Swimming Pool Chemistry

Trichlor is good but it may be acidic so you need to adjust your pH level after shocking. Some facts about chlorine:

For every 10 ppm Free Chlorine (FC) added by Trichlor, it will increase Cyanuric Acid (CYA) by 6 ppm.

For every 10 ppm FC added by Dichlor, it will increase CYA by 9 ppm.

For every 10 ppm FC added by Cal-Hypo, it will increase Calcium Hardness (CH) by at least 7 ppm.

I use Calcium Hypo. when I shock the YMCA pool and there's always a powdery film on the bottom. It takes about 2 1/2 hours to vacuum.

I first fill the pool all the way to the top, then vacuum to WASTE. This way the powder doesn't get caught in the filter. It goes straight into the sewer. If you use this technique be sure the keep an eye on the water level. Don't allow it to get below the skimmer or else your system will draw in air.

This will work after a wind storm as well, when the dirt has settled to the bottom. I did this when I maintained pools in Arizona.

Without knowing the chlorine level after the shock it's difficult to say if your wife used too much shock. If all the readings were fine before and now you have cloudy water, there's a high chance it's the shock that did it.

Keep the chemical levels correct:

Pool Tips..Swimming Pool Chemistry..Cloudy Water..Green Algae

You want to bring the shock level up 10Xs the normal level you normally run.

Pool Shock..Chlorine Shock..How To Shock A Pool

I would encourage you to get an FAS-DPD K-2006 Taylor test kit. It's the best on the market. You only need to shock if the chloramine level is 0.6ppm for 3 consecutive days. Other than that you're wasting money and time.

Water Testing Kit..Swimming Pool..Water Hardness..Cyanuric Acid..Chlorine..

Swimming Pool Supplies

If you keep your chlorine level between 1.5ppm - 3.5ppm and the CYA between 30 - 50ppm, there should be no reason to shock other than after a very heavy bather load, bad wind storm, etc...

It's the chloramine level that dictates whether you shock or not. Not because it's Saturday. The FAS-DPD kit has that test.

Hope this helps and let me know how it turns out for you

All the best

Robert

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AQUAZONE FLOC

by JASON
(NJ)

I USE BAQUACIL PRODUCTS FOR MY INGROUD POOL. I'VE ALWAYS USED THE BACQUAFLOC PRODUCT WHICH WAS CRYSTALS. I WOULD ADD IT TO THE SKIMMER AND IT WOULD HELP THE FILTER REMOVE OUT THE DEAD ALGAE. I WAS SOLD A DIFFERENT PRODUCT THATS A LIQUID FLOC AND I WANTED TO KNOW IF ITS THE SAME AS THE CRYSTALS OR IF I COULD USE IT THE SAME WAY. I WOULD LET THE FILTER RUN NORMAL AND BY THE NEXT MORING ALL THE CLOUDY NESS AND ALGAE WOULD BE OUT OF THE POOL AND IN THE FILTER.

I WOULD BACK WASH IT AND THEN USE A SAND FILTER CLEANER AND THE POOL WOULD LOOK GREAT.

I'M SCARED TO USE THIS FLOC BECAUSE IT SAYS DON'T ADD IT TO THE SKIMMER, BUT THE POOL COMPANY I BOUGHT THE CHEMICAL AT SAID TO DO IT ANYWAY.




Thanks for the question Jason

First I'll ask you why you think you need to floc the pool. If the pool is cloudy, you put the floc in it, and then the pool is clear, that's great, but it doesn't address why the pool is cloudy to begin with.

What many people do is hope the floc cures the pool. Many times it doesn't. It's just a band-aid on a much bigger issue.

There's many reasons why a pool can go cloudy. Many times it's the first sign of algae:

Cloudy Pool Water

Basically, you shouldn't need to floc the pool at all, if the chemicals are right.

Here are some posts to look over:

How Do I Clear Up Baqua Floc Stuff?

Switching From Baquacil To Chlorine

I'd like to have your complete chemical readings:

Chlorine, CYA (cyanuric acid/stabilizer), pH, Alkalinity, Calcium Hardness, and Metals (iron and copper). It makes troubleshooting much easier and the process of clearing up your pool will go much faster. You can get this done at your local pool store.

Without these numbers I'm just guessing at what the problem is.

It's like having a headache and taking lots of Ibuprofen. Sure you may not feel anymore pain, but pain is a way to tell you something is wrong.

Something is wrong with the pool if it's cloudy and you have algae. It's time to find out why so you won't need to floc the pool anymore.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Cloudy, Milky, Discolored Pool Water " category.

Check back to this post for updates or answers.

If you need immediate assistance (within 24 hrs) or for emergency personal assistance, you can make a donation of your choice and I'll answer your questions by phone.

Contact Me

Donation

Hope this helps and have a great Summer.

Robert

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