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First You have to determine what caused the stains and try to prevent duplicating the situation once the cleaning process has been completed.

There are two directions you can take toward getting the plaster to a near new state. You will most likely never achieve the same look that the original plaster had when it was installed. Some stains will remain with the most diligent of processes. Both methods include muriatic acid. The methods differ in the way in which they are applied.

Neither one of these methods should be attempted by a novice - - no previous experience.

One direction you could pursue would be the older and time tested method of acid washing a plaster pool would involve draining the pool then with the proper safety precautions, equipment and tools, start the process of the actual acid wash with a diluted solution of muriatic acid and water. This method may take from a few hours to two days to totally complete.

The alternative method involves a totally different and unique method called a "No Dran" ( no drain acid wash). This method works by first disabling the pump - insuring that the pump will not start during the whole procedure. There are a certain amount of other steps to be taken to do the "No Dran" properly. Depending upon size of the pool or amount of water - muriatic acid is added to the pool water in proper quantities so as to bring the total alkalinity to zero. Background experience is a major step in knowing how to start, how to aid the process during the procedure and ultimately knowing when to stop the process. This method will take from about four days to two weeks to complete depending on how severe the plaster conditions. This method could also include draining the pool after the "No Dran" is finished. This is to ensure that all or most of the minerals that caused the stains are removed - because they would now be in suspension in the water - and will not be re-deposited on the plaster a month or two down the road. This method has proved successful in pools with colored plaster.

With each method, after completion, there is the start up procedure to be completed.

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Q: How do I remove blue stains in my pool plaster?
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How do you get green stains off the pool plaster probably from tree debris?

Green stains (copper color) that cannot be removed indicate you might have a pH problem. K


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Do you want to stain the pool these colors? Or have you already done this thru lack of knowledge of swimming pool chemistry? If the latter, you have grossly added too much muriatic or dry acid to the pool. Unless your area has acidic water then you still have failed to correct the problem with chemicals made for that purpose. The pool has been in an acidic condition for some time in order to get these stains. The stains are a result of improper chemistry balance - pH and alkalinity. The stains are coming from the copper pipes in your system - if no copper pipes then the heater heat exchanger - it is copper. Adjust your pH to and maintain at 7.2 to 7.8. Adjust you alkalinity to and maintain at 80 to 120 ppm. You need a good four in one test kit to do this. Cheap test kits do not give you what you need in order to maintain water quality in your pool. You have a sizable investment in your pool - don't skimp - it will get you every time. If you have caught the problem early enough it may give you no further headaches. Wait the approx. 5 to 8 years for when the water needs to be changed and then have the pool professionally cleaned but be sure to get someone you trust and get recommendations. See what work they have done before deciding on any one company. k

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