I haven't been round these parts for a while but my dad passed away last week and I am now dealing with his fiberglass spa that I can not get clear of CC regardless of all that I've tried. High chlorine, mustard levels even.
I can't afford the electricity to continuously run the spa and am giving up. It is currently draining slowly and I see what look like black algae spots in the cracks but they so not scrape off, nor do they smear of course.
I have been able to scrub some of them off with a green scratchy and I plan to attach them with straight bleach once I get more water out. It doesn't seem to respond well, but perhaps I didn't wait long enough.
When I got here to care for my dad full time the spa had 0 chlorine and 0 cya. I began treating it with testing guiding me. Got 20ppm cya into it and it finally was able to hold onto chlorine better. But no joy with cc. Always at or over 1ppm. Brushing into tiles needing to be re grouted, cleaning cartridge filter, and sad brushing left no joy. between caring 24/7 for my rapidly declining father, his death and the **** that goes along with all that I just ran it at 16ppm or higher most of the time. When I could keep it at that level, that is. In the end, nothing has truly helped. I didn't really even notice the black till today. It's been a hellacious 2.5 weeks for me and I make no excuses for the mistakes I am making. Can't hardly even remember the dogs names...
With all that said, here are my questions:
Do I use a wire brush on this?
Is it too deep in the cracks to be treatable?
What could it be if it doesn't scrape off?
What can be done for the cracks to prevent it again should I successfully treat it?
Should I trash the spa?