standpipe advise

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Rob is describing Herbie's silent overflow system. There is a great thread on this at Reef Central that started a couple of years ago.

Definitely go for Herbie's overflow system if you really want silence.

I would use a gate valve rather than a ball valve, much easier to control, I started with a ball valve then changed over to a gate valve and it made a big difference.

With this system you just need straight perforated pipe for both the primary (gated ) standpipe and for the emergency overflow pipe.