Koi Forum • Compact sieve v Easypod for prefilter : Koi Talk What are you pre-filtering to? Not much experience of the EP, but I know some use it as a prefilter before showers etc. Seen some posts where they were very happy with em. 2,200 Gallons. Block Built Celotex insulation and Fibreglassed. Midi Sieve – Eco 12,000 – Bio-Max 50 Bead filter. Skimmer – Eco 8,000 – UV – 3Kw Elecro Heater Clarity Shower with K3 Media. Airtech 130 to Richdon Aerated Bottom Drain.