Pools With Black Plaster

by Michael

I have a pool in Las Vegas which of course is very sunny. It may need re-plastering.

If I choose black, will it absorb the sun and stay warmer?

Thanks for the question Michael

Yes it is true that a darker plaster will absorb and keep the heat in the water long than white plaster. Basically what you're asking is if a darker color plaster will conduct heat, then transfer that heat into the pool water.

When you have a conductive to heat source it also allows that heat to escape from the pool. A simple example is Styrofoam. It will insulate both heat and cold, but may allow it to escape at the same rate.

About 40 - 50% of the heat is within the first foot of water. You can use a clear or light blue solar cover will decrease evaporation to maximize the heat during the day.

Multi colored and darker plaster is wonderful if mixed and applied correctly. I'd suggest looking at Diamond Brite plaster and finishes. If you get a variation in color it's not because of inappropriate mixing, it's the dye in the cement not changing color of the cement when not properly applied. It also should be troweled during cooler or overcast days.

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Hope this helps.


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Plaster Turned Black

by Michele

My plaster & pool are about 2 months old. My maintenance person was attempting to clear up a calcium issue and as soon as he started treating it for that, the plaster turned black. He would no longer communicate with me after so I don't know what happened.

I found "First Choice Scale Stop" and "Jack's Magic" in my recycle bin. He finally called yesterday and admitted to messing something up but again would not say what he did. He said the black was my plaster and not algae. I can't find any pool company that has heard of this. Please email me your thoughts

Hi Michele. Black plaster and/or pool water is almost certainly an indication of copper in the water. A chemical reaction takes place when chlorine mixes with copper. I can't find the MSDS for the first product, but I do know Jack's Magic is a metal sequestrant and is used for hard water and water with metals.

He probably panicked and ran. I don't have the info on his side so I can only guess. It's what happened to the Rio Olympic Pool, but let's hope you won't need to do a drain and refill.

First is to not add anymore chlorine. Maintain a lower FC of 2 ppm using liquid chlorine. If it's high, you need to wait until it decreases. Decrease the pH to 7.0 - 7.2 and add the seqeustrant.

IF you have metals stains you're going to need to do a citric acid OR an ascorbic acid treatment. Citric is for copper and ascorbic is for iron staining. The process is the same, it's just you're going to need about 1.5 - 2 times more citric acid than ascorbic acid.

Link is here:

AA Treatment

During the process you can use a PolyQuat 60 algaecide because your FC is going to be low. Doing either treatment will cause a big chlorine demand and you're going to use alot of it to get back to zero FC. Basically, you're FC will be - 10 ppm or so.

Then add the metal sequestrant and slowly raise the chlorine and pH to normal levels. Continue to add the metal sequestrant at a maintenance dose each week to replenish it.

ProTeam's Metal Magic and Jack's Magic The Pink Stuff are good sequestrants and have the ingredient HEDP or phosphonic acid, which is what you need.


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