grainfather pump

Hello folks! A question on the safety valve and clogging with the G30 (v2 but I believe the valve is identical to the v1). Virtually every brew to date has involved clogging (sometimes extending the brew day by an hour - and certainly not helping the wort!) when using the counterflow chiller...

The pump on my Grainfather has been misbehaving for ages, barely working and making awful noises, particularly just when you want to cool down the flameout hops which are going to bitter the brew if the wort doesnt get recirculated through the chiller. Couldnt bring myself to shell out over £100...