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The skimmer on my inground pool has one hole, so a float valve, commonly used on skimmers with two holes, would not apply. Other than maintaing the proper water level, what are the ways to protect the pump from air getting in the skimmer piping from low water level?

It's been said that you can save money by switching your single speed pump with a variable speed one. According to this attached YouTube video, it ain't so. Has anyone on this board done the actual calculation to prove this? If so, please provide the detailed calculation (and the proof)...

There's a line of brown stains that I've been trying to remove. It looks like rust (see pic above). I tried muriatic acid, chlorine puck, and vitamin c tablet without success. Any ideas? I'm thinking it might be rusted steel (rebar) coming though plaster.

Pressure gauge on the filtration unit of my pool indicates zero during normal operation when the valves are open to the drain, skimmers and the return. The gauge is not broken. There appear to be no leaks; and the flow seems normal through the skimmers and the return lines. When one of the...

See pictures below. Is it acceptable to see leakages like that coming into the pool?

How thick should the gravel be under the concrete pool decking? Also, are there Code requirements with regard to the minimum thickness of the gravel? For the pool that I'm having built, the average thickness is about 2 inches, with bare spots showing in places. This does not seem adequate to...

The pool is under instruction with decking and plaster still to come. There are rust stains now on the gunite wall, one under the light and another on the wall (see pics below). The PB wants to apply a bonding agent and then plaster over these stains. Is it likely that rust stains will show up...

Iron stains are showing up on several areas on the coping (see pics). The PB did not warn us that this would happen. This coping stone was one of the choices made available by the PB. On one area, the stain is even dripping down into the plaster area of the pool. I would hate to be swimming...

I'm having a pool built in my back yard and I noticed what looks like a rebar stain on the side (see pics, below) Do you think this might cause a problem? The pool still needs decking and plaster. The builder started on this pool back in November of last year and is still at it on and off...

I'm having a pool built in my back yard and I noticed what looks like a leak stain on the side (see pics, below) Do you think this might cause a problem? The pool still needs decking and plaster. The builder started on this pool back in November of last year and is still at it on and off. The...

Pool Math Targets shown on my computer PoolMath are pH 7.2 to 7.8, TA 80 to 120, CH 200 to 400, and CYA 30 to 80. On my iPhone App, they are different : pH 7.2 to 8.0, TA 50 to 90, CH 250 to 650, and CYA 30 to 60. Which targets should I use?

I'm doing a "what if" evaluation for the upcoming season and need the expertise of the board members. Your inputs are appreciated. When adding 56 oz of 20 Mule Team Borax to raise the pH from 7.2 to 7.6, how much will the TA (60) and CH (70) levels increase? When adding 12 lbs of baking soda...

Hello, Glad to get on board. I'm currently having a pool built in my back yard. I was surprised to find that the Corona Virus has been good for the pool builders, at least tha's what my builder is saying--people are staying home more and making their homes more livable--although, a long time...