I have had to do 3 SLAM's so far and the algae just seems to come back after a few weeks. I have kept the FC levels up between 5-7 (my CYA is 30) to keep it higher than the target per advice from this forum. I take the pool brush to it every other day and run the filter at least 6-8 hours a day. My husband pressure washed it a bit ago and it came back, then I recently used a puck to scrub directly on the rough surface and SLAMed again. That takes it away, but after a few days of being done and back at the FC of 5-7, I can already see the algae trying to form again. Redoing the pool is just not in the budget at the moment - we were budgeted for the house (lived here 6 months), not a neglected pool. But obviously we have to do something or this is just going to be a constant battle. Any suggestions that won't break the bank?
Here are some pictures of what I am dealing with, it goes around the entire pool: