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Sulfamic is just as effective?

Have customer with 5 year old plaster (new pool). Has some extensive copper staining (using some “blue” chlorine product). Plaster feels smooth to the touch. See pics. This forum has me paranoid about acid washes now.

I can't seem to find a 2 speed pump for an inground spa that is set up with pool type equipment and that has pump basket, etc., for inground set up. Of course, lots of 2 speed spa pumps out there without a pump basket. Current set up is a Sta-Rite Dura-glas Dual Speed Pump connected to a compool...

Fascinating. Looks like it.

Dumb question, but best/safe way to test with acid? Scrape some off and then hit with acid?

See attached pics. I assume this is crystallized calcium. Customer called me about this. Other company did an acid wash and closed up the pool and I'm afraid they did nothing to balance the chemistry. (have not been out to test chemistry yet, but obviously it is off). From research, seems like...

OKAY. Thank you!

Okay. I just responded to AWJ22 regarding the pump converter board. If it's an older model (before 2020), and does not have the RS-485 connection, what is your recommendation?

I just looked. It's a 2018 manufacture date. It's a "PMP Superflow VS 1.5", manufactured 6/25/2018.

Super helpful. Thank you!

Have a customer with a Hayward Aqua Plus panel that wants to add wifi. From my research, the Aqua Connect system is discontinued and no longer supported so probably not something I would recommend to him which leaves the OmniPL upgrade kit. We just install and service way more Pentair sytems...

The sanding would still shorten the plaster life, but obviously would make it smoother to walk on, so still just a temporary solution.

Yes. And came back out today to look more closely. As expected the CYA is too high to test without dilution. One drop seems to obscure the dot. And I did notice that the “stains” do have the smooth finish worn away. So I’ll probably recommend replastering it and definitely not an acid wash. May...

I’ve got a couple techs who have done it before (I’m a new-ish owner and haven’t personally done it) but I’m not sure they’ve been trained to do it “the right way” in their previous employment or what to adjust depending on plaster condition etc.

Very helpful framing. Thanks!!

Thanks!!

Got called out to a customer's house where his plaster seems to have some pretty extensive copper staining (see pics). I went out for a different reason and didn't have the jack's magic stain kit, but there are blue stains across large swaths of his pool. I will confirm, but they appear to be...

What is considered “low” vs “high” TA? Keeping the TA at 50 is a little counterintuitive, though the LSI math makes sense, as a supposed drawback to “low” TA is fluctuating pH, and the supposed benefit of “high” TA is resisting changes to pH. But perhaps I just need to reframe what is high vs...

Correct, but even in a pool without CYA, would you still ignore trying to adjust FC according to pH? Just doesn’t make a big enough difference even in a CYA free pool?

So the chart we all see about effect of pH on HOCl (below), practically, doesn't make a difference? I guess in my mind I was thinking, okay, at a pH of 7, it's 75/25, or whatever, so if your FC is 4 PPM you have 3 PPM of active/effective chlorine and at 8, if it's reverse, you would only have 1...