η απαντηση του pond guru
You won't need a very large air pump for that size pond - maybe 400 litres per hour? Just make sure when you order one that it has plenty of pressure if you intend having air stones on the bottom of the pond - check with seller as it really should be a 'pond air pump', not an 'aquarium air pump' as they often don't have d enough pressure to produce much air down to 1m depth..
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