The water in the sump is generally pretty clear so I don’t think it will be too much of a problem - in any case it’s a spring operated thing with quite a lot of space inside for flow, I don’t think fine particles would bother it too much.
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BTW thanks for the link - didn’t buy from them because Amazon was cheaper once delivery was factored in.
Amazon €17.95 delivered (Prime)

Water fitters - €12,10 with €9 delivery
I couldn’t believe the cost of them nowadays, but I suppose we were buying them in bulk and it was quite a few years ago.
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Likewise, seen a considerable jump in price on most pool plumbing and ancilleries.
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Nothing seems cheap these days. Just noticed that Waterfitters has a 50€ minimum order so would have been stymied by that anyway.
Delivery also kills on small orders from independent retailers who don’t ship enough to get much discount from the couriers.
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