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As I've been talking through this troubleshooting with @mcleod, the factor that is well outside of my wheelhouse is the stress to the pool structure. I wouldn't even want to drain my concrete pool like this. How much draining can a vinyl pool withstand? We're already seeing sags and wrinkles...

(OK, you all saw it. He asked first, I didn't shove it down his throat!!!) Why, yes, as a matter of fact!! One of my favorite threads! (Note, I have an EasyTouch, but all the principles would apply to IntelliCenter.)...

This is the one I always have to rewind and rewatch a couple times!

On second look, they all look tweaked out of position. I say let it leak, to see if the water drains down below the returns.

Which port is this? Has the water level ever drained down below it? Or has it stopped here? It looks to be under a lot of stress. It's poking out, and there's a big wrinkle just below it. It's definitely been tweaked out of its original position. Sidebar: you don't need to keep addressing any...

You mean from his filter? Dern it, I didn't think of that! We've been analyzing how the water drops and what's been going on in his yard (some recent work was a suspect). He's been monitoring the bucket test the whole time, so he ruled out evaporation. He just replumbed his pad, and had his...

I didn't even read all that. We've all got our own similar list. ;)

I'm very interested in this. If it doubled the time between scrubbing and/or halved the work, that'd be something.

Or just unplug it so it can't do anything.

Did you examine the two sealing surfaces with a magnifying glass? You'd be looking for a lump of something that wouldn't come loose by just rubbing it with a cloth (or the Q-tip you're not supposed to use). Or a crack.

If you use a moderate amount of lube, and hand tighten, then torque another 1/8 turn (with towel or tool), and you get a leak, then you're not doing it wrong. Especially if you've tried multiple o-rings. The reason I suggested the o-ring swop is just a matter of thorough trouble-shooting. If...

+1 ^^^

It's only one side leaking, right? You could swap the o-rings, one end to the other, to see if it's the o-ring or not.

In the first pic above, note the screw and washer holding the IntellipH base to the pad. They've got some rust on them, but I think that's because the screw is just plain steel. Now look at the pipe on the wall, and its clamp and the screw holding the clamp in place. No corrosion. Those are my...

No. There are lots of stirrers available, just not one that will fit through the grid of an IntellipH. Which is why I fabricated it. I used a fiberglass rod I found at Lowe's (in their signage department, I think). Really that's all you'd need. Just an acid-proof rod to swish it around some...

Other things to recheck. I think you said you replaced the o-ring and that didn't help. If not, do. Feel the o-ring all the way around, a few times, hunting down bumps, splits, cracks, deformations, etc. Be sure the lube coats every bit of the ring, but don't slop it on. Shiny, not gooey. You...

I'm in the other camp, I can't get things tight enough with just my hands anymore. I use a giant pipe wrench to give an extra 1/8 turn after hand-tightening. I have never lubed the channel in which an o-ring seats. Not for my pool equipment, not for my scuba equipment. I was taught to lightly...

Ha, I just read that back and it sounded a bit like a payola scheme. To be clear, the money you donate to TFP goes to infrastructure: web and app development and internet expenses. Everyone helping others here are all volunteers, pool folks just like you, who came here for help with their pool...

Yep. I couldn't say. Mine is going on 5 years and it's fine. I'd be concerned about running it underground. Your PVC idea is good, but if the tube is going to have a low spot, then it could collect condensation or water entering from the exit end. If that tube is full of liquid, for the few...

I probably wrote to route the tube as far away from metal as possible, not getting a longer tube. I wouldn't try 100', though technically it should work. You'd run into resistance with a really long tube that was full of water (or had collected condensed acid fumes). I would have also mentioned...

If your manual vac head is not performing, and you have the vac plate as good as it's going to get, you might try a different head. There must be literally a thousand, of every shape and size and configuration. Or a small brush might give you better suction for spot cleanups. I have one like...

Yep, that's what I meant by "with the exception of certain types of bypasses." Here's an example of an SWG bypass: It's purpose is to dial down the flow to an SWG, in cases where the rest of the system requires more flow than an SWG can handle. In this setup, depending on how the flow control...

Money can be better spent on alarm/security systems, for sure. Other than the slight deterrent mine might provide, I didn't really install cams for security. I use them to monitor my pool and pad. I can check that all my doors and gates are closed and locked. I can see if I left the stove on. Or...

I really like POE. Way more reliable than WiFi. And no wiring 120V or batteries. If you go with PTZ, you gotta go POE, too. You can tolerate viewing a fixed angle cam if it drops a few frames, you'll hardly notice it. But when you're panning and zooming, if the signal isn't fast enough...

If it makes you feel better... I inquired of a local door shop about the window in one of my exterior doors. I was considering replacing the door, or otherwise securing the window. They said that breaking windows is not a thing thieves like to do. Too noisy. Unlike a whirring DeWalt motor...

PS. If I tried the above and ruined the female threads beyond use, I would probably just epoxy in the new part and hope I never have to do it again.

This is the gist of it. This 'tube is about how to do this on metal pipes, but the MO would be similar with plastic.

It looks like the acid tank Pentair sells with its IntelliChem system (same tank as the IntellipH, without the pump). And it's pretty beat up, and yours is about 11 years old. As you say, if you can't get the old parts out, there's not much to be done. If you're ambitious enough, there is...