Hi all. Newbie and first-time poster here. I look forward to learning a lot. In the meantime, I have a question regarding an interior surface issue I’ve been left with compliments of improper maintenance by former occupants.
I bought a home and resurfaced the plaster pool with Ocean Blue Pebble Sheen in early 2009. It came out incredibly well. I enjoyed it for a bit and then unexpectedly wound up renting the house for 3 1/2 yrs. I have recently moved back in and now see that the pool interior exhibits some dark spots, 2 of which are much larger than the rest. After determining none of these spots were black algae and gathering some other clues, the gentleman who did the resurfacing came by with the Ocean Blue Pebble Sheen triangular sample yesterday. We placed it in the water and the result is in the attached picture (this is one of the 2 larger areas)…
Shortly prior to this, I obtained an e-mail that the tenants sent to the property manager in May 2013 which stated they had a “power wash" of the interior done because they could not get the pool clean after a series of storms. And lastly, the darker areas still have abalone shells present (I had some more added to the Ocean Blue mix), whereas, they are virtually nowhere to be found anywhere else (i.e., the lighter areas).
While the tenants have not replied to inquiries regarding this issue, I am left to believe that a true high rpm power washer was indeed used in May 2013 on the well-established surface, and this is what I’m left with. What is my best course of action here, aside from resurfacing the entire interior again? Drain the pool and try to power wash the remaining spots? Try a high pressure acid wash on the dark spots only? Acid wash over the entire surface? Something else?
I am disgusted to say the least, and am open for all suggestions. Thanks.