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.