Welcome to our forum.
I feel for you man! I think you have done about all you can chemical wise, other than straight muriatic acid on the stain, I have never seen such a thing. Dealer gave you the chems, and in my eyes should be somewhat responsible for it. Let them do what they can for it, even though they have tried by the sounds of it. I think it will go away in time, but how long is that time?? Have you mentioned replacement spa yet or has it come up. It's not going to be a Bullfrog problem, but a dealer problem. Hope they can figure it out for you!!
Have you looked at the MSDS sheet for this product yet? Not surprised it's not coming off after the close up, it does look like the acrylic is damaged.
A big sigh of relief on your side I bet! Glad they fixed it for you, it's what customer service is like from a good dealer!
Quote from: Jacuzzi Jim on June 16, 2016, 03:51:42 pm Have you looked at the MSDS sheet for this product yet? Not surprised it's not coming off after the close up, it does look like the acrylic is damaged.I agree, but how in the world does a "standard" chemical out of a plain jane startup kit burn acrylic? that's just crazy...I had a customer who let calcium go crazy to the point where we literally had to (with his permission, he was selling the house so he had no choice but to either try this or dispose of the entire spa) pour straight 100% muriatiac acid onto the shell, it got rid of the problem and thankfully it didn't cause any further issues but even straight acid didn't damage his acrylic...this is very odd
I used to get rid of rust stains ALL the time with muriatiac acid. Works well and has no effect on the acrylic. When acrylic is thermo formed it becomes porous. Staining can then get into the pours. muriatiac acid cleanse it out almost instantly.
I'm not saying it's the reason, but I always pre-mix my chemicals before adding them into the tub.I have a large size mason jar with lid, maybe 32oz.Add the chemicals to that, scoop up some spa water, lid, swirl to mix, pour slowly into spa.