Our pool was replastered in Dec '11. We just started using the pool to swim & noticed the pool surfaces are rough & sharp from some sort of deposits mostly on the walls but also on the floors as well.
Thanks for the question Scott
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.
Next I need to ask some questions. Do you use calcium hypochlorite - granular chlorine? If you do you need to stop. The new plaster may not be able to handle all of the extra calcium.
Did the plaster company tell you to brush every day? This might removes some rough areas and spikes to smooth the plaster.
Do you have crystalline deposits - is the surface rough and scaly? It might be high metals in the water. If this is the case, you'll need to use a good metal sequestrant. Metal sequestrants that are based on HEDP, phosphonic acid and/or its derivatives are the most effective.
Some popular brands are Jack's Magic Blue, Purple, and Pink Pink Stuff, Metal Magic, Metal Free, & Metal Klear.
This is normally not a one shot deal. 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 will need to add a bottle once per week.
There's also a chemical used to break down calcium deposits. It's called HydroQuest. You can talk to your plaster company about that and see if it's applicable to your situation.
What start up did you use for your plastered pool? An acid or bicarb start up? And what was the outcome of that? What did the plaster company say?
As you can see there could be a few reasons why this is happening. If you could answer the question above and give me your chemical readings I'm sure we can find a solution.
To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Start Up/Opening A Pool" category.
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