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The article is a fine primer on corrosion and the author does a decent job of bringing the issue down to the level of the reader. As he states at the end, corrosion is far more complex than can be stated in a 2 page article … there are thick textbooks written on the subject! The zinc anode...

The only way to repair them would be to drain the pool and inspect the cracks. If they are less than the width of the quarter, then it will be impossible to fill them with plaster patch. So they would have to be keyed to make a wider channel and then patched. It will look ugly no matter what...

Do you have a picture of this area and/or an engineering design drawing for the beam attachment? Is the screen enclosure permitted separately from the pool build?

Depends on how you mount it but no filter fills all the way to the top so water can drain back. Even when running there will usually be a small air pocket at the top where the air relief and gauge is. When the system is off, the air pocket is usually bigger. This allows water up at the gauge...

Also that’s the wrong style gauge to use. The gauge you should install is one where the brass nipple is on the rear of the gauge, not the bottom. That way it reads easier AND, more importantly, water doesn’t get trapped inside the gauge.

Your chlorine is probably very high. DPD can bleach out at high chlorine levels whereas OTO (the yellow chlorine test) does not. I suggest you get a pool water sample, dilute it 1:1 with some distilled water, and try retesting.

Those are self-tapping machine screws. Obviously the one screw was not threaded and so when assembly was done it never cut the threads into the plastic. Just go to the hardware store and get an exact match to the threaded screw you have and screw it into the plastic hole where there are no...

What’s covering the perimeter drain channel? Don’t want to stub a toe …

Some stone waterfalls built around here use natural boulders and a special waterproof mix of mortar. If the waterfall has small basins built into it, then the basin can be hand-formed using hydraulic cement with a final layer of water barrier applied. The water barrier is typically a cement...

ASR cannot be diagnosed from the outside of the pool by looking at the plaster. Only a core sample or removing the plaster can tell you what you want to know. Your situation looks more like pools that develop cracks in the plaster that extend down to the gunite shell. Once the water is in...

Curious about the gutters for the overflow edges - how are they being finished ? I noticed they run to the infinity edge trough … how will they empty down that wall and what finish will be there?

Lower pH is better for H2S removal as the solubility of H2S in water is very sensitive to pH. When using aeration processes to remove H2S, a pH of 6 will drive most of the hydrogen sulfide into the gas phase. Unfortunately you can’t easily do that in a drinking water well but if your pH drops...

I think Robin may have been the proverbial “canary in the coal mine” in a previous life 😉 perhaps that explains the choice of her given name 🤔 What is the pH of the well water ?

Are you using regular GAC or catalytic GAC? If you can find a source of catalytic GAC, that may help reduce the H2S to sub-Robin levels …

I wouldn’t adjust anything. Just drain the water. Nothing will harmed.

Aside from the skimmer not being able to skim when the water is too high, No. Just pump out the excess. Let the water mix for an hour (maybe consider brushing) then retest and add as needed.

Electrical resistance heating, aka, Joule Heating, is a microscopic phenomenon. The heating is caused by the flow of electrons (particles with energy associated with them, not waves ... but let's not get into quantum mechanical arguments) through a material conductor where the electrons undergo...

350lbs of sand. Says it on the label. Your model is an S270T. There is no such thing as a filter being “too large”. TFP always recommends installing the largest filter you can afford on a pool as it reduces cleaning/backwashing frequency.

Your CYA is less than 20ppm.

Baume is simply a measure of relative density and its use comes form the manufacturing control processes employed at the factory. It is much easier and safer to measure a liquids density especially when dealing with a hazardous substance like concentrated mineral acids. There is direct and...

True as well. But this VSP motor is from a "cheapo" manufacturer ... there's not telling what they did or how they programmed the VFD. Even the VFD can have a big in-rush current as it charges up the capacitor bank for intial startup and speed changes. If the RC time constant isn't...

Most inductive loads have HUGE in-rush current. It’s can momentarily spike as high as 10X the spec’d amperage. Good electrical designs will attempt to mitigate in-rush as much as possible but it still happens. There’s not much you can do when the load briefly looks like a short-circuit at...

PoolMath displays Total Alkalinity which is the parameter you measure with your test kit. It calculates carbonate alkalinity in the background in order to calculate CSI. It makes all of its recommendations based on TA, not adjusted TA. As you see, if you follow Pooli’s advice, you will get a...

20 years is a loooong life time for a pool heater. Unless it’s something very inexpensive to fix, it’s not worth it to repair it. You’ve gotten all the life you can expect from it so if it’s not a simple fix then trash it and move on.

That plug is officially damaged and should not remain in service. You’re asking for a potential fire. As others have mentioned, you need to check the plug, the breaker it goes to, and the wiring. It all needs to be rated for 20A. Most residential outlets are NOT rated for 20A but rather...

Oh my Lord DO NOT use terra cotte or saltio tiles outdoors here … that would an absolute nightmare for upkeep and you will cook your feet or melt your shoes on them in the summer heat. If you plan to have a pool here and your area has hard water … pretty much all of AZ does … then you need a...

@mas985 has been experimenting with using “old” cells to produce chlorine by simply running them beyond the point at which the controller shuts them down. Turns out they’ll continue to produce a fair amount of chlorine even at advanced age.

Trex is a composite material made of wood fibers and recycled plastics (plastic bags and shrink wrap). Has it been dry out lately? Try spraying down the deck with water from a hose. Get the deck nice and wet. Then walk around on the deck and touch the pool water. See if you get a shock.

You probably need new filter cartridges at this point. Adding any form of clarifier or floc to a cartridge filter system is a recipe for disaster. The clarifier, along with all the crud it has picked up, will get embedded into the filter media and basically plug it up. No amount of cleaning...

Almost all heaters work this way. Thermostatic control via a closed relay is the only way to make heater control available to all automation systems without having to maintain and provide a set of digital controls. RS-485 is starting to show up in newer heater models (Pentair and Raypak) as...