![]() If you are applying acid wash to a pool plaster and the mix foams and hisses then you are very likely damaging the plaster. This is contrary to the method that is used by the majority of service companies. This is far too strong to use on pool plaster! When correctly done, an acid wash should be 90% acid brushes and elbow grease. This results in an acid wash that foams, spits and hisses when you pour it over the plaster. What most pool service companies will do is use 4 to 1 or even 3 to 1 water to muriatic acid. One of the biggest concerns about acid washing pool plaster is what strength of acid you should be using. If the thickness of the plaster is the reason that plaster improves water retention in a swimming pool, then why do you need to redo plaster when it is still clearly there? The reason, is that once the smooth finish wears away on your pool plaster, you have effectively lost all improved water resistance over any other form of untreated and porous concrete. ![]() This is factually inaccurate and really a shame that so many people are going to damage their pools as a result of bad advice such as this. I recently was reading an article on acid washing pools on a popular "how to" website (which is read by millions of people) and it said that it is OK to acid wash every two years since pool plaster is 1/2" thick on average and acid washing only burns off the surface layer of the plaster. It is this smooth finish that increases the water retention abilities of the plaster - not just the plaster layer itself. With a skilled hand this will result in an extremely smooth plaster finish. When plaster is used as an interior surface in a concrete swimming pool, a technique known as a "hard trowel" is used which is essentially a final, very firm, pass with a steel trowel once the plaster is almost completely stiff. ![]() Plaster, just like every other type of concrete, is porous. When you use a pool plaster for the interior surface of your pool, it is not the plaster itself which provides an increase in water resistance, but the finish on the plaster. The only problem with this is that it will be anything BUT newer. For anywhere from a few hundred dollars, to a thousand or more, you can have your pool drained and acid washed and it definitely will look a lot cleaner and newer. In areas where there are a lot of concrete swimming pools, acid washing pools is big business for service companies. By using this website you are agreeing to the terms and conditions. For more information see the full disclaimer page. In order to keep this resource about pools and spas available for free to all readers I earn commissions for purchases made through links on this page.
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