You obviously havent seen unedited live footage . Sorry you have been misinformed . Also , you would do well to keep the abuse to a minimum , o keyboard warrior . <| sep |> I need new best friends . <| sep |> The pressure shooting up once you opened to BBT would suggest either that your top pressure in BBT or at least somewher in line to BBT was too high or too low relative to your filter arrangement . If high , the back flow could have knocked the filter bed off of the plates in which case you ' d have seen rough beer downstream of fikter and probably blinded you trap downstream units . Alternatively , and based on your comments below , this seems more likely the BBT pressure was too LOW , leading to the rough beer flow rushing through the filter bed faster than it could handle it , thereby collapsing the bed . In this latter case , the outflowing beer would have stayed nice and clear , but your flow would have quickly but not immediately dropped and pressures risen . What was the differential between inlet and outlet ? Tracking this should help you narrow things down in the future . Do you have the capacity to control the back pressure on the filter outlet with a restrictor valve ? If so , do you have a recirculation bypass before the PRV ? If you do , in order to elimimate pressure spikesdrops you can set your back pressure regulator completely closed while the unit is on recirc and bleed it open to BBT slowly while simultaneously slowly closing your recirc valves to maintain pressure equilibrium in the filter bed .