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I have two of them for acid and chlorine, each one is in one of the small boxes at the bottom.

I've been running this pump for chlorine for over 2 years now with no problems. Amazon.com I figured out how long it takes to pump 1 oz of chlorine and have a program that pumps 1 oz at a time however many times I need to get the dose I need. I split up the dose and put some in every hour but...

I just noticed your talking about a hot tub not a pool, which might make things a bit easier since the amount of time needed to mix the chlorine will be much lower. For my 30,000 gallon pool it takes a while for added chlorine to affect the ORP reading.

I use the second method to add chlorine. I set a given amount to add each day and have a program that adds part of the amount every hour if the pump is running. I have an ORP sensor, but I just use it as an indicator to tell me if I'm way out of whack. If the ORP reading is way too high I will...

If those white wires really are hot and not neutral, you should put a wrap of black electrical tape around them near where they connect to the screw terminals. That is an indicator that even though the wire is white it's a hot wire not a neutral.

Also, try to avoid having all of that bare wire exposed. Trim the stripped portion of the wire so that it is just long enough to insert fully under the screw terminal but no longer.

In the Sacramento CA area, my 30k pool uses around 40 ounces a day in the summer. So my 15 gallon tank lasts around 6 weeks at the height of summer. At the moment I'm using around half that, and in the winter I'm only using around 10 ounces per day. So really the answer is it depends. That said...

Added a roof, on hinges, to protect all the stuff, but still have access to work on things.

Here is the Atlas Scientific EZO boards and carrier board I "designed". Does it count as a design when it is basically just a bus? This box also routes the water temp and water level sensor cables. The version 1.5 board, this is after I disconnected all the wires, has made way for the version...

I'm using tygon r-3603 for the acid. I got it from McMaster.

I've had it running in various configurations for the last 2 summers without any issues, so I'm not too worried about the high temps. My neighbor has an oak tree, you can see the leaves in the last pic, that overhangs the equipment pad so that helps some. The other thing is that there aren't...

I'm a programmer by trade so I wrote everything custom. I have a routine that watches the flow meter and sets a GPIO pin when the flow meter is on. Then I have two programs that add Chlorine and Acid. They turn off the flow pin, and then check to see if it has been turned back on. If so then...

The sensors have to be in a loop to make sure they don't ever dry out. The acid is diluted 4:1 and it takes 7 seconds to add 1 ounce of the diluted acid.

I had a friend help me do it.

15 gallons of Chlorine and 15 gallons of muriatic acid diluted 4:1. Any Ideas on what to do with my old pool sweep? I've already repurposed the return line for it as the pipe I put my eTape liquid level sensor in. So all it's doing is sitting and taking up space. I'm also thinking about putting...

I leave mine out so the robot can run on its schedule.

I'm going to be building a "roof" on hinges that will cover the equipment and the chemical tanks.

To be fair, there was soo much particulate matter in the pool that the flocculant actually was helpful. But the first couple of years we were buying shock by the case at Costco and I don't want to know how much we spent on silver algaecide. At least we managed to avoid the phosphate removers.

They only keep the Crud out of the filter, not the pool. I had a few pods/seeds get into the pump basket and sprout.

But I like my new system. lol

Then one day a sickness came over the land and the owner was forced to work from home. So with all the extra time available, the owner finally got off his butt and started building the automation he had always wanted to build. Version 1 was build and installed along with new wiring and mostly...