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Ogdento, Thanks for your reply! Should have clicked on your Saturation Region blog before proceeding. Yes, noticed I lifted that pad -- that was the second attempt at fix when the Menu button and Select right button still misbehaved. When reinstalling, shifted the button slightly to bridge...

In case others review this inactive post, just tried today to replace the buttons on my 520657 EasyTouch8 control panel. Nope. I do have some solder skills, but apparently inadequate. Bought the buttons from DigiKey, PTS645SM95SMTR92-LFS, $0.46 each. Used very fine cutter to snip the old...

Another update in case anyone searches for Pentair acid pump. Last time I replaced the peristaltic tube, I could not remove the roller assembly. Decided to wait for cool weather when acid demand drops (because less make-up water is added I think.) Had to use a soldering iron to melt the Lexan...

Regarding diluting concentrated acid, "Do as you oughta, add acid to water!" Issue is concentrated acid heats rapidly with small amounts water, or slowly added water. Think of hot oil and water. Seems you have done fine with your method Dirk, but a caution for others. And I am seriously...

Discovered what I did wrong. The black poly tubing end at the acid tank top had a half-inch split (pictured), which was enough to reduce the acid flow by almost half. Cut off the split and reconnected, and seems acid back to normal, now 1.6mL/second pump time. To make sure changing check valves...

Thank you all for being so generous with your time. Especially JoyfulNoise – apparently, I have forgotten much of my chemistry training. I now see that using softened water will reduce the total pool water use because pool refills would be needed much less frequently than my current three-year...

In case anyone accesses this old thread, an update. The "debris" that plugged the Pentair 522513Z check valve was actually the rubber seal inside the valve that the ball seats against. Finally disassembled a failed unit. The rubber breaks down, and the ball gets stuck, blocking acid flow...

In Las Vegas, we have over 200ppm calcium and magnesium in tap water. A softener substitutes two atoms of sodium for every atom of calcium or magnesium. So the sodium output would be over 400ppm. (No, you can't taste the salt -- far below your taste threshold. Please look up how an...

Guess I'll need to construct an electrolysis experiment using my pool water to prove to myself the bubbles are H2 and O2. Obviously, chlorine is also generated, but I assert it reacts almost instantly and does not appear downstream. For my syringe to explode as it did in my demo, must have...

Have seen statements on TFP that the gas bubbles generated by the SWCG are hydrogen and chlorine. I believe chlorine reacts too quickly with water for that to be true. Although chlorine gas is stated as only slightly water soluble, that is irrelevant because it rapidly reacts with moisture to...

Blew a 2-year-old, 400W incandescent in my spa and figured I would just go to LED. Installed a 12W, 120V, daylight-white LED (Kollniun brand) that the description said was a Spa/Pool bulb. Replaced the fixture gasket even though it was only two years old. Worked perfectly with great...

In case anyone finds this post, an update. The roller assembly should be replaced each year with the peristaltic tube. The rollers begin to stick, abrading the tube, and get very noisy. Found the Stenner Econ White Pump Roller Assembly EC350 (US Water SKU: 411-EC350) for $19 each. The Santoprene...

When visiting a friends house in St. George, Utah, I took a look at their new pool install: 4800 gallons, plaster, about 4ft deep, automated pool cover. Then I took a look at the equipment and was shocked to see three pumps, two of them variable speed! Check out the photo. All Pentair...

Hey Gene, missed your suggestion trying the mom & pop stores. Success! Of course the store is as far across Las Vegas from me as you can get, but they have 31.5% acid for about $12/gallon. Thanks!

Thank you both for your help in this and my previous issues. I really appreciate it. I'll track what happens in the pool and report back. With luck will prove out OK, otherwise, at least we get a lessons learned.

My closest 31.5% MA is the Bullhead City Home Depot. Have not found another source yet in Las Vegas, but still looking. Hmm... Just looked at Amazon again, and can get 31.5% for $26.25. Hazardous material shipping is expensive.

Anyone else using ACID Magic in place of 31.5% HCl in their IntelliChem? Any issues? This topic appears periodically, but now from me because Leslie's Pool no longer stocks 31.5% acid and sells this instead. Leslie's was the only place I had been able to get the 31.5% acid, a concentration I...

Marty, thanks for the comment. My reasoning is: I have to add chlorine in the winter, and was looking for a non-permanent, seasonal way to inject chlorine with my Stenner pump, hopefully a way needing infrequent attention once I find the correct rate. Glad you said the SWG cell did not need...

Was looking for an inexpensive dummy cell I could modify for winterizing my Pentair IC40. There's not enough space after the IC40 to attach a saddle for a permanent injection point (run into valves for spa and water feature), so thought I could modify a dummy cell to include an injection port...

Thanks for your insight Dirk, and taking the time to help. Actually, discovered that the acid tank continually develops new debris. Maybe stuff falls in when I take off the lid, or plastic scrapes from the container edge each removal. So my initial statement that you could clean the tank once...

Suggestions to eliminate acid check-valve plugging? Have a Pentair IntelliPH acid dispenser with a tank-mounted Stenner pump. The Pentair 522513Z check valve plugs once a year with what looks like fine black plastic shavings. I see a very small amount of black debris in the acid tank, but...

Just to clarify for anyone that finds this thread in a search. Yes, you can use potassium chloride in a salt water pool, although Pentair says you shouldn't and it costs three to four times more than sodium chloride. Have done so for 3 years now. For my area, refill water is pH 8.1 with...

Others have commented that ORP sensors are inaccurate. On my IntelliChem, I shift the ORP setpoint based on Free Chlorine measurement. Refilled the pool a week ago (glass tile removal -- empty to avoid shards left behind) and the ORP matching my desired FC decreased to 600mV, when before it...