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It's a very, very old pool with no fancy bells/whistles: Jandy VS Flopro pump; Triton TR-100 sand filter...and that is entirely it. No heater, no black magic, etc. There are two skimmer baskets in the pool that are plumbed together, and a main drain at the bottom of the deep end. It's a 20x40...

I passed the OCLT last night/this morning: 11PM: FC - 10.0 7:30AM: FC - 9.5; CC - 0.5 ...however, the stubborn cloudiness persists. Should I maintain SLAM levels, or dial back down to regular FC levels?

Couple of other questions: 1) Is there a particular brand of DE that works well? I typically just order things off Amazon. I see in the overview page you linked that I should just avoid garden DE. Is there something at a standard big-box store (e.g. Home Depot, Lowe's, Menards) that would work...

I will pick up a silicone-based lube for the O-ring today and give that a shot. For what it's worth: I tried the pour-water-over-the-lid trick to see if that temporarily resolved the air-in-the-pump problem, and it did not.

I slowed the pump to 1,500 RPM. The pressure on the sand filter is now about 7 psi. There is still air at the top of the pump, and I can definitely see air bubbles coming out of one of my returns, but not the other. Here's another video of the pump, this time running at 1,500 RPM:

Clean filter pressure is around 18 psi. I am typically backwashing at around 24 psi. At the beginning of this process when the water was still a very dark green color, I was having to backwash every day. The last couple of days the pressure has really not been climbing at all. Thank you for...

I do not get a lot of air out of the returns. Can you spell out "checking all sources of air on the suction side" in more detail for me? Explain it to me like I'm a third-grader, since when it comes to my pool I essentially am. I'm in the process of getting CYA up to 30+. If you look closely...

I'm at my wit's end here, folks, and desperately hoping for some help before I rage-sell my house and move somewhere with no pool. Here's the scoop: I have a ~35,000-gallon plaster pool. When we opened this year, our pump was completely shot, so we replaced it with a Jandy VS Flopro. It took...

...there isn't one! My pool (gunite) is currently drained for some refinishing work, and I wanted to replace the hydrostat. I popped open the main drain and, lo and behold, there's not one in there! Should I be concerned? Does adding a spot for a hydrostat simply require that a hole be cut...

Okay, that makes sense. Thanks!

Correct. Here's a gnarly photo of some of the tile that hasn't been ripped down yet, just for clarification.

I'm not sure if I know what you mean, Dave. There are 6-inch tiles all the way around the top of the pool -- I'm removing all of those and all the mortar/grout/thinset/whatever, which is leaving me with just a smooth concrete surface, as pictured above (less the mortar joint under the coping...

As it happens, the angle grinder is working like a charm. The mortar bed is very weak, and is coming away quite easily. I'm pleasantly surprised with how well it's working. Now, the joint that was between the old tile and the coping is very brittle and is just falling right out. Is this...

Wow, an electric jackhammer up on the side of the pool? Sounds startlingly difficult (my shoulders already hurt just thinking about it). Will it be easy to take away...more than I intend to if I'm not careful, or will the grout/thinset come off without fear of hammering through the side of the...

We have a fairly gigantic (20' x 40') gunite pool that has been around for nearly 60 years. The previous owner was 93 years old by the time we bought the house, and all of the neighbors say that the pool went a good 8-9 years without being opened. I was able to get it sparkling clear last year...

That is an excellent idea. I will definitely try that out, as disintegrating leaves seem to be the main issue that's leading to so much backwashing. Thank you!

There is definitely quite a bit of fine stuff still on the bottom of the pool. I can finally see the shallow end of the pool and it is almost entirely clear, but quite a bit of stuff gets churned up when I brush on the deep end, which is still very cloudy. I've been hesitant to vacuum to waste...

Hello! First I'd like to send a blanket "thank you" to the pool wizards here. Your seemingly endless wealth of knowledge has gotten me started, and I'm excited to learn more! Here's the scoop: my wife and I just bought our first house. It was built in 1956 and we are only the second owners, and...