Hi everyone. New to this site. I had diamondbrite installed many years back, and it's finally breaking down - to the point that when I get algae, the algae gets into the crevices of the broken down portions of the diamond brite, and I try brushing it out of there - I've even got this tool where you insert muriatic acid directly onto the spot and the brush attachment should clean up the algae, but it doesn't budge. If I really shock the pool, brush everything down to the deep end of the pool, vacuum, clean out the filter, the algae stays away for a few days, then comes right back. It's a vicious cycle, and I know I need to have the pool sandblasted. What are the latest products out there now that have a longer life?