My Pool Water Looks Milky Below The Surface

by Steve Splaine

I recently opened my pool. The water was sparkly and looked clean.

I went on holiday for a week and when I got back my pool looked dirty. I shocked it as instructed and then covered it.

Unfortunately my pool has now gone milky. My readings when tested are pH level is approximately 7.5 and my CI DPD reading is 2.5

How can I correct this problem?

Thanks for the question Steve

There are many reasons why a pool can go cloudy. Many times it's an early sign of an algae bloom.

Cloudy Pool Water

Thanks for the chlorine and pH readings, but I'll need the rest of them as well: alkalinity, hardness, and cyanuric acid/stabilizer. What kind of pool do you have - plaster/concrete, fiberglass, or vinyl?

If you could answer the questions above I'm sure I'll be able to help.

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.

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Hope this helps and have a great Summer.


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Minerals In Pool Water?

We just bought & filled a very small pool 8' x 30". But it instantly turned yellow, minerals from our well water?

How long after we add mineral out should we see any differece & when can we swim?

Also is it ok to chlorinate soon?

Thanks for the question

If your pool turns brown or yellow right after filling, or after chlorinating, you probably have high iron and/or copper in the water.

Well water is really bad for this.

First, is there a way to fill your pool up with an alternate source?

If not, there are way around the discolored water, but it'll take time, patience, and a good metal sequestrant.

A metal sequestrant does not remove metal from pool water. It holds it in solution until it can get filtered. Then you backwash the metal out.

Because metal sequestrants break down over time and get filtered and backwashed out, you need to weekly dose your pool if you have high iron and copper.

Metal sequestrants that are based on HEDP, phosphonic acid or something similar are the most effective.

Jack's Magic Blue, Purple, and Pink Pink Stuff, Metal Magic, Metal Free, & Metal Klear are very good.

Get your pool water tested for metals, and all of the other readings as well, to confirm.

By adding chlorine you're oxidizing the water because chlorine is an oxidizer which just helps to convert the iron to a red ferric state.

What this means is the iron was already there, but the chlorine made it visible.

Use the sequestrant on FILTER 24/7.

You'll need to clean the filter once per day.

It's difficult to say how long it will take for the water to clear. It depends of the amount of iron, filtering quality, and how well a pool owner stays on top of the chemicals.

An educated guess, all things being equal, would be about 5 days.

To post a reply, or if you have a similar question, you can see your post (Minerals In Pool Water?) on the Q&A page in the "Well Water Problems/Iron & Copper" category.

Swimming Pool Questions and Answers

Check back to this post for answers.

Hope this helps and have a great Summer.


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