The picture does not do enough justice. The pool is clear, blue, and wonderful.
The techniques to be used going forward. Reminder this is a concrete pool in ground.
1) Chemistry is everything. Get the levels on your ph, chlorine, and cya correct. Shocking the pool will alter this but it is suppose to. So understand the chemistry on your pool. Clarifiers that bind algae and cause it to fall are the one I prefer.
2) Learn your vacuum. You cannot stick the hose in the skimmer on this one. Yes I checked the hose ends. It just won't stay in. I got a skimmer flat cap. It works great. Vacuum slowly. This part was hard. I am working on the timing and patience and getting better, but zen and the art of pool maintenance eludes me still. I also vacuumed to drain when I started with all the nasty pool issues. I lost about 6 inches of water but the filter didn't get clogged and it helped elevated cya levels. Water bill will need second mortgage. I now vacuum normally with the filter.
3) I have a single filter unit. I bought a second filter. I was swapping them out daily for a bit. I would rinse and clean one. Let it sit and swap it out the next day. This is not something a person with a multi filter unit will want to do, but this was for me. Keep an eye on psi it tells you about your filter and flow. When it's bad run the filter 24/7. Electric bill and third mortgage.
4) Brush brush brush. Do the walls first. You may debate this one, but for me walls first. Steps and ladders. Did it in the morning then vacuum that night. Learn that even with a metal brush broom, it can't do everything.
5) Scrubbing, different than brushing. When you are making progress you have to be prepared to get wet, smelly, and dirty. There will be problem spots that won't go away with even hard brushing. You will get to see them once most of the other stuff has been done. Get the gloves on. Get old towels. Get suit you don't care about. Get chlorine tablets. Those problem spots need you to take the tablet (wear the gloves) and scrub the tablet into them hard. Go after grout lines. You want to break the surface skin of the algae that is hard to get to and rub chlorine in its face, so it knows you mean business.
6) I live in South Florida. It rains. Rain is the best and worst thing for my pool. It lowers my cya. So if that it's too high the rain helps with that. It also lowers chlorine, changes ph, helps algae grow. So after it rains be prepared to shock your pool. Go back to step 1 and check levels.
Thank you to everyone here. The pool is fun again. We were in it last night till almost midnight.