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ThanksThe tank. I know you said it's already filled, but I was in the same position as you a few years back and I think in hindsight I should have just drained mine and drilled it.
But if you do go with an overflow, I think the PF1000 would probably work quite well ☺

That's bloody noisyPS this is what I mean by my PF Nano being noisy. It was louder than the television at normal volume.
Agree, when starting out I used an Eshopps PF300 for years, never gave me an issueThe fear of HOB overflows in this hobby is a little dramatic. I've used HOB overflows for over a decade and never had a single flood.


