Hallo und herzlich willkommen im Forum. Ihre Frage kann sicherlich nicht pauschal beantwortet werden. Wie groß ist denn der Teich? Wie viele Zuleitungen, sprich wie viele Bodenabläufe und Skimmer haben Sie eingeplant? Wie erfolgt die Rückleitung zum Teich?

Dear Jurgen,

your numbers are a bit confusing. I assume you have 3 drains (two bottom drains and one skimmer) which is perfect for this pond size. As Long as there is no big height difference or small pipes/hoses back to the Pond I would recommend two AquaMax Eco Gravity 15000. This fits perfect to your Pond size and the UV's and you can get the maximum filter result. Also 2 pumps will give you more safety if something damages a pump one day. We wish you a great time with the new Pond!

... Ok. Then the recommended pump size is a Minimum. Please don't use bottom Drains with flow rates below 6.000 Liters. Otherwise they will congest regularly. Also it will be challenging to get a good flow on the skimmer.