How to measure sand that is still in filter

[PoolDoc]

If it holds DE, the filter is functioning. It may not be optimal, but it's still working.

Regarding the oversize pump, it's a bit of a chore, but with many IN-GROUND pumps (Hayward, Jandy, Pentair) you can replace the original impeller with one that's a step or two down. This will cause the pump to draw less electricity and pump less water. It's not quite optimal, but it's close.

HOWEVER, you have to replace the impeller and pump seal, and possibly the diffuser. Also, on many pumps you'll need to replace the case seals. It's not super hard, but it's not for beginning DIY'rs. One important tip: many screw-on impellers are reverse threaded!

Regarding the block: when I became active on the forum again this spring, I had accumulated over 10,000 spammer registrations AND had 3,000+ spam posts in the moderation queue -- most of them porn.

Right now, I'm using brute force methods to keep them out, including blocking IP ranges that include proxies or spam sources. For example, because both Caltech and MIT host "Tor" routers, I've blocked their entire networks (or at least all I could find) . . . and I won't lower those blocks, until I have a more sophisticated firewall in place that can dynamically block anonymous proxies and VPNs.

But, I have made some errors. If you want to check, go to "whatismyip.com" from work, and then email me ([email protected]) the IP number it reports. If it's blocked in error, I'll take it down.

[swimdaddy]

I have toyed with the idea of putting in a smaller impeller, but there is one nice thing about having an oversized pump. I can run an auto pool vac and a solar heater at the same time with the throttle valve wide open. This combination of suction and return restriction keeps the flow down where I like it so that even though the valve is fully open, I am not blowing fine particles through my filter(ish). I am sure its not so good on the pump, nor the electric bill, but I justify it because our electricity is so cheap here, lots of hydroelectric dams.

I will check on the IP address thing. Thanks.