I have an older Laing hot water recirculating pump under the sink. I want to install a simple undercounter water filter for cold water at the sink. Should I install the filter before the pump or after the pump?

  • 1
    Do you want the hot water to be filtered also? Jul 23 '17 at 1:56
  • No, just the cold. The pump has a cold and cold out, hot in hot out where the water on the hot side goes below 85 it circulates it back into the cold line for reheat I connected the filter after the cold out but the faucet flow is very low - make claims small decrease in faucet flow.
    – R Pilgrim
    Jul 23 '17 at 4:07

Put the filter after the pump so only water being used at the faucet is filtered,since filter life is based on the amount of water running through it.

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