Salt that is high in contaminates and not dissolved properly can stain the surface of swimming pools.
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Salt Staining Salt staining is becoming more common due to low quality salt products being used in swimming pools.  When salt does not dissolve, it sits on the bottom of the pool floor.  This causes the metal contaminates in the salt to leech out and stain the pool surface.  Because of this, salt stains usually look like metal stains because they are brown or grey in color. The most common causes of salt staining and how to prevent it 1)  Poor methods used when adding salt.  This is the most common cause of salt staining we see. Some pool owners leave the entire contents of salt bags at the bottom of the pool to dissolve.  Some even pour the salt in the shallow end of the pool hoping that the water will simply dissolve it over time.  How to prevent it: Be sure to disperse the salt around the entire pool and then brush it until it is completely dissolved.  Good quality, fine salt will dissolve very quickly. 2)  Poor quality or contaminated salts.  Some inexpensive salts have large crystals which take longer to dissolve.  This can increase the chances of staining.  Low quality salts will sometimes leave a brown haze on the floor of your pool because there are metal contaminates within the salt.  How to prevent it: It is important to ensure that the salt is thoroughly dissolved.  Purchasing high quality salts with finer grains is recommended. 3)  Contaminated salt grains.  If contaminated salt grains are left on the pool floor for extended periods they can sometimes appear like rust spots or brown spots that won't brush away.  If you experience this frequently, you may want to consider changing your brand/supplier of salt.  Even the very best salt will have the odd contaminate from time to time but issues should be few and far between.  4)  Adding salt when the water chemistry is out of balance.  When the pH of water is very high, it loses the capacity to hold minerals and metals in suspension.  This means that most minerals and metals from contaminated salt will drop to the pool floor and leave a stain.  Because minerals and metals found in contaminated salt are not white, salt staining can present in various colors but is most commonly brown or grey.  How to prevent it:  Always make sure that you balance the water BEFORE you add salt to your pool to avoid salt stains. How can the Pool Stain Removers help to remove salt stains? We customize specialist chemicals that remove almost any type of staining that salt can leave behind.  Our products are effective on white plaster, glass beads, fiberglass, tiles or any other pool surface.
High quality, fine grained salts should always be used in salt water swimming pools.