White Chalky Substance

ChelseaSoccer

Active member
Feb 5, 2017
42
El Paso, TX
#1
Hi guys, I have a two part question.

When brushing the pool I've noticed a white chalky substance dispersing.

Normally, only noticed it when brushing the steps of my plaster pool. Yesterday was the first time we braved the frigid pool temperature, in which we noticed the bottoms of our feet were white and the pool surface was slick to the touch and to walk on.

Here's the question, any idea what it is? Is it normal? If not normal, how to get rid of it?

My filter was cleaned by a pool professional in January and we recently did a backwash.

Below is a picture of my hand after touching the pool surface:



Thanks for the help


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pooldv

Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
Aug 10, 2012
24,993
DFW, TX
#2
Please post a set of test results and what test kit you are using. An older set or two of test results would also help.
 
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ChelseaSoccer

Active member
Feb 5, 2017
42
El Paso, TX
#3
Test results from 4/8 except when noted:

FC: 6.5 (4/15)
CC: 0
pH: 7.6 (4/15)
TA: 80
CYA: 40
CH: 320

Everything is stable except for my pH which fluctuates D/T an attached spa. The TA ranges between 70-80 depending on when acid is added for the pH.


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pooldv

Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
Aug 10, 2012
24,993
DFW, TX
#4
Your test results look pretty good and don't indicate any other issues. White, chalky residue without indications of scale or other issues in a plaster pool tends to come from paint failing in a plaster pool. We don't recommend painting a pool because the paint only lasts a couple of years and then it makes a mess, becoming chalky, peeling, etc.
 
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ChelseaSoccer

Active member
Feb 5, 2017
42
El Paso, TX
#6
The house is a rental, pool was in poor shape when we moved in. The plaster is chipped or actively chipping throughout the entire pool and spa.

And the white, chalky substance is on every part of the plaster that is submerged (walls, steps, spa, floor bottom). The walls and floor are slick to the touch as well.


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Patrick_B

TFP Expert
LifeTime Supporter
Jun 7, 2011
14,999
Midland TX
#7
I agree, and curious about the question of it being painted. Looks like it may have been. If so, it wont get any better I'm sorry to say. Looks like a re-plaster in your future.