looking for a GOOD pump for <2000gallon pond with the top of the 4 tier waterfall head being 12-13ft above the pond. Also looking for recommendations on filter system as this is a koi pond. There will also be an additional return and intake for a side fountain to the side of this but needs to be part of the same water system (its a multi level stone patio with the waterfall/pond in the middle). If anyone is adept at viewing arch plans I can put up a pick if it will help.