both 20" pre filter housings exploded!! cracked in 2 with horizontal split and a vertical split right to top!! Contacted cleaningwarehouse where system was purchased and installed...quoted £35 plus VAT for each fillter which I thought was a bit steep considering the system is only 11 months old...I mentioned this to the guy on phone and he said "yes it is expensive but we only use the best part!!"
"well they cant be that good, they have just exploded and Liverpool hasnt been THAT bad compared to other parts of UK"
"well you shouldnt have let the system freeze should you!" the cheeky sod said!!
anyway, got replacements elsewhere and have transferred RO system from van into shed with heater and insulation in place...needed a heater and submersible pump as well so spent over a £100 and lost 2 days work