This time we’re noticing that only three of the pop-up water movers in the in-floor cleaning system are popping up and squirting water. It became obvious when the usual fall supply of acorns and leaves began lingering in mid-pool instead of being swept across the bottom toward the drains in the deep end where we could easily scoop them up. Also the green algae have been returning.
This site suggests we check the pressure first, then the filtration system, and last the pop-ups themselves. The pressure is the same it’s always been. So the issue may be in this rather complicated-looking apparatus. Meanwhile, I got one of the pop-ups out of the floor and discovered that its rubber seal was weakening, to the point where the black color smeared off on my fingers. I need to get the rest out to check them.
And, wouldn’t you know it, once again, there’s a hurricane off the Baja threatening big rains here by the end of the week.
THE TEXAS SCRIBBLER 
If you only could get some of them rains our way.
It’s around 100F here for the last few days, and no signs of relenting so far.
You think your “O” rings are bad? Shouldn’t be, if they are neoprene – they should stand up to water indefinitely, though it could be something with the chlorine or hypochlorite in the water making them degrade. UV degradation, possibly. Since water is mostly transparent to UV.
If it was at work, I’d go to the catalog and get some PTFE ones, and try them as a cheap solution – if they were too stiff, sometimes a problem, go to the high dollar, permanent solution – Kal-Rez, and I DO mean high dollar.
But my bet would be the impeller, since it’s only one of them.
Must not be neoprene, as they are smearing black when wet, and flaking when dry. Definitely deteriorating. Also when in use they’re shielded from direct UV. On the other hand, they’ve lasted almost thirteen years.
Also when I relaced one of them with the only replacement ring we had, its pop-up and three adjacent ones started coming up as advertised. Just not quite high enough to squirt water. So I’m going to replace all of them, before turning to the “impeller.”
Well, JD, after a little cogitation yesterday, we’re going to get a maintenance guy in here tomorrow and check the impeller. It does seem like the most logical source of the problem.