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So higher pH with lower TA to narrow the pH band? Do you then keep a somewhat elevated chlorine level to compensate for the higher ph? And its affect on “active” vs “inactive” chlorine?

Super interesting. Great point.

This is what I had assumed. So regardless of the LSI, you should maintain a pH (and perhaps TA) floor to protect the copper heater (pH of 7 or above) while still maintaining a good LSI balance (below 0.30) to prevent scale in the heater.

This is strictly a theoretical question, given that in most scenarios to achieve a proper LSI you're generally going to have a TA and pH that will be fine for your heater. Acknowledging that, does a copper heat exchanger care more about LSI or pH? Seems that LSI is mostly geared toward plaster...

Will do.

Everything is indoors. The Pentair rep locally here said it would likely need a different gauge wire, but good to know re 4 wire cable may work. Because the compool is not a load center, I’ve quoted the customer an intellicenter lite to use alongside the existing breaker panel.

Curious what others would recommend to upgrade a client from the compool 3800 system. Intellicenter? Their system consists of a single speed whisperflo, hayward aquarite salt cell, pentair MT250 heater (older/fireman switch connection). As part of the compool system, it includes a pool side...

Thanks James. When the pool opens up, I'll see if we can get a better view of the pipe. Would you have concerns about running a liquid chlorine feeder in metal plumbing as well?

What is the potential problem between cast iron plumbing and SWG? I was contacted by a customer who wants new equipment, and I was going to suggest a SWG, but came across this post that I could be a problem. Plumbing is galvanized coming out of the ground but she was told it was cast iron...

Not really joking, hence the question. Most everything above ground would be replaced. The leak fixes are around valves. But are you suggesting if that is leaking, that the in-ground plumbing is also likely leaking? What is the expected life of in-ground galvanized or cast iron plumbing?

Was contacted by a customer who wants a new equipment set. The pool is closed for the winter, but looking at the equipment room, it appears the equipment is connected to galvanized 1 1/2" plumbing (see pictures). The customer is telling me they were told by the pro who used to maintain/service...

Thank you for the detailed response! So the covering of the spa and the heat (though he keeps it at 70 degrees when not being used, and he doesn't use it often), along with the high alkalinity is driving the pH rise between visits even without much visible aeration. Sounds like the first order...

I meant to say is the pump increasing *pH* through aeration? Even though there are no visible bubbles?

Here are my measurements from my last visit... 8+ 190 TA 350 CH 0 CYA 3200 Salt/TDS Inground spa size is about 1400 gallons. I adjusted pH down to 7.2 and the alkalinity came down to 170. Customer has naturally high alkalinity in the water. Upon filling the spa a couple months ago, the...

I told him as much, that it was definitely a chemistry issue that ruined the heater. I'm hoping I can talk him into a SWCG moving forward.

He is telling me he was measuring pH regularly with strips and adjusting as needed, so if I believe him, I'm not sure the pH and TA would've actually got down that far with him adjusting along the way, but of course I'll never know. In response to some of the other comments, there have been...

I just tested CYA. Had to dilute it, but it’s in the range of 450-500. You think the ph was below 5 then? Seems that would very quickly kill a heat exchanger. I’ll also read with the pH probe I’m reading later. And yes, who knows how much base they added previously. The sampling I did...

I’ll go back in the morning to get CYA reading. And I just ordered the pH meter. Thanks!

I didn’t measure, but per orenda app, that seems to have only slight impact on LSI within a range of 10 to 100 all else being equal.

I’m here measuring chems. TA is 120 or so. CH is 1250, very high. I had to add 34 drops of base reagent to get to a ph of 7.2 or so. What would you think the ph is based on that? To then estimate LSI?

We sold a refurbished Mastertemp 400 to a customer a few weeks ago. It ran for 2-3 weeks without issue then the customer calls me last week to tell me it's leaking for the air intake and that the heat exchanger is damaged. I of course want to do right by the customer. I didn't visually inspect...

Okay. Whoever closed his pool did not put any sort of cap in the overflow line between the spa and the pool so the spa level can only get so high before it drains out and at that level, the weir seems to restrict flow too much into the skimmer. I'll put a plug into the overflow line which should...

Perfect! Thanks! That's helpful to see the difference. The PS error hasn't come back since I closed the skimmer valve, which again tends to suck air, which is good news.

I get that's the bypass valve, but just making sure I see the spring in there? Indicating it isn't broken and still functioning?

Awesome. As an update, I did replace the stack flue sensor and stuck around for about 20-30 minutes and the heater operated well with the temperature climbing and the stack flue temperature reading in the 300's (371? or 330? I can't recall exactly). However, later that evening I checked the app...

I’m working on a heater that repeatedly cycles on and off but still seems to slowly climb in temperature. And it shuts down it’s giving me an HLS error. I replaced the thermal regulator which seemed to have some modest corrosion on it. And now it’s shutting down with an E05 error. Tracking the...