Springer said:Counter flow system is not to hard to make but needs a pumped flow to be effective and is more challenging to keep clean, sanitize :)
Springer means the wort flow is pumped, the cooling water from mains pressure is fine. at first I used one gravity fed, and 60+L of wort through 10m of 10mm copper coil was too slow. Introduction of 12V pump halved the time to about 25min. With an immersion chiller would probably be slower overall, can't speak from experience for 60L brew but I'd guess about 45-50min including collection in FVs. Anyone?