Pool has made remarkable progress for 24 hrs! I've been checking and readjusting to SLAM level FC (28ppm) every 2-3 hours. Nice and blue now and just a bit cloudy. I can easily make out the drain and imperfections on the bottom of the 6ft deep end.
We dropped from 28ppm to 23ppm overnight. I just tested again a few hours later and had dropped from 28 to 26. Sun is out now, so I'll take future results today with a grain of salt.
I also tested combined chlorine this morning and got 0. Is this expected?
The pool is now crystal clear! But, I still seem to have dropped FC 3ppm (28->25) overnight, so I guess we are not done with SLAM.
I have not bothered cleaning the filter yet. The filter pressure has stayed pretty constant at 10-11 PSI since starting.
There is very little algae still left on walls, its just hard to scrub in the very corners from outside the pool (will need a smaller brush and get in).
Is it ok to leave these very minor areas till after, when we plan to get in the pool anyway?
I had heard that up to SLAM levels was safe, but because we are maintaining constant SLAM level FC, I was concerned whether a minor FC measurement error (for example, actual is 31ppm instead of 28ppm) would still be safe to swim in.
Welp...We brushed everything off. Pool is crystal clear including all walls.
I decided I should clean the filter, and at the same time, replace the drain plug which has had a slow leak, so that we could pass overnight test.
I got a 6 point hex wrench specifically for the pre-2005 pentair filter drain plug. Well, the leak is faster now, but my wife and I could not get the filter drain unstuck no matter how hard we tried. The wrench is just slowly rounding off/popping off the hex pattern.
Guess we'll have to get some professional help and start over (since the leak is enough now that I don't really want to run the pump all the time).
Welp, fortunately a pool repair service had someone available that was 10 min away from me.
They came out, were also unable to open the drain valve. The valve had cracked in the center, and that's where the leak was coming from (I bet someone over tightened it long ago). This is also why the leak got faster after we tried getting the drain plug out, it widened the crack.
They opened up the filter and drilled it out from the inside (I cleaned off my absolutely gross filter cartridges while they were working on that part). I was amazed at how much green those filters were holding.
Pump is back running, with much cleaner filters, and no leaks (actually there's one on the union on the pump outlet, but it only leaks for ~15s when the pump starts up, then goes away).
Also, whether we pass the overnight test or there are more learnings, I want to say such a genuine thank you. I felt pretty hopeless picking everything up fast enough when we moved in and had other house projects going on, but I've learned so much.
That is a beautiful transition pic.
I have never pulled the plug on my Pentair canister. I use a shop vac from the inside to clean the bottom. I've read many stories like your experience with that filter plug.