The suction line pulls water from your tank to your pump and a pump will not operate correctly without sufficient inlet pressure. For your suction line to perform at its very best, the pipe needs to be the same diameter as the inlet to your pump. Old pipework is often a lot smaller in diameter and over time can cause debris to build up, restricting the flow and adding extra stress on your pump – this can also cause you to lose up to 20L/min – something to consider if you’re having a less than enjoyable shower.
Having a short straight line of pipe from the tank to the pump is recommended. Elbows in the pipe work cause uneven flow and long lines with improper pitch or humps can cause air pockets to gather which again disrupts the operation of the pump. If the tank is below the pump the suction line should run up to the pump.
If a suction line is cracked and leaking it can create a partial vacuum which sucks air into the line causing interference with the pump’s operation. We often find hardening of the ground can move pipes and fittings in the system too, so regular checks are important to ensure the whole system is working at capacity.
Changing out your suction pipe is a fairly low-cost exercise compared to replacing a pump because it’s been over worked or overheated. Replacing your suction line at the time of installing a new pump is a simple way to ensure your new pump is set up to work at optimum.