Swimming Pool Acid Wash Tips

Doing an Acid Wash for the first time can be challenging but there are some things you can do to make it go smoothly. The first thing you need to do is to assess the pool to see if an Acid Wash is even the proper thing to do. By this I mean, maybe the pool needs more than an Acid Wash and will need to be resurfaced.

If the plaster has cracks and chips in it already, an Acid Wash will make things worse. There will be more chipping and bigger chunks of plaster will start to come off once the pool is refilled. A Pebble Tec pool with pebbles coming off or cracks is a sign that an Acid Wash should not be done. This will make the Pebble Tec surface worse and not better.

You also want to be careful not to drain a pool down if the outside air temperature is above 90 degrees. This can also cause the plaster to chip, but not until you refill the pool. Sun exposure at that temperature will weaken the old plaster and the chipping will appear over time. So it would be optimal to schedule Acid Wash offseason when the weather is mild.

The Acid Wash mix is the most important element of Acid Wash. Here are the products that you need for a successful acid wash. You will need 31.45% Muriatic Acid mixed with water in a 2 to 1 water to acid mix. Bio-Dex Plaster White ‘n Brite to help thicken up the acid solution so that it runs smoothly down the walls of the pool and to reduce the acid fumes. Bio-Dex AquaDex 50 Stain-Off which helps to remove iron and other metal staining from the surface. If you use this Acid Wash mix you will have great results and the plaster or Pebble Tec will look as good as new!

Here are the detailed instructions from Bio-Dex on how to do an Acid Wash the Bio-Dex way:
https://drive.google.com/open?id=1DySSQfRRvUU00yqGC09EQvYVsrPkZV1y

I modified their method because it calls for mixing everything in a 5-gallon bucket and the pouring it down the sides. But I have always done my acid washes using a Water Pot as I find this to be the easiest and most effective method. So in the video I show you the Watering pot mixture also.

Acid Wash Tips:

Always wear protective gear as the fumes and acid are hazardous.
If it feels very rough like sandpaper, chances are there is a lot of calcium build up on the surface. Before doing Acid Wash you will need to power sand the pool surface. You can rent a power sander at Home Depot and then sand down the entire pool surface prior to Acid Wash. During Acid Wash if you notice the staining is not lifting off, take some sandpaper and rub the area. Then pour the acid mix over the area again. If the stain lifts then you know there is a coat of calcium build-up on the surface and you will have to power sand the entire pool.

Never use just straight acid on the surface. This will etch and damage the surface and will create streaking of the plaster. If the stain is not coming off calcium is probably the issue and not the acid mix.

The basin in the deep end is very critical. I always add Soda Ash to the basin and leave the Sump Pump (Submersible Pump) running so that the acid running off the walls does not pool up and stain the plaster. If this happens, once the pool is filled you will see a discolored ring around the deep end of the pool. So, keep the basin filled with Soda Ash or Baking Soda to neutralize the acid as it runs into the deep end basin and out through the Sump Pump.

If you follow these tips your Acid Wash will turn out great and your pool will have a new lease on life.

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