Here at Jameson Pool & Spa we stock a great range of Multi-Port valves for the major filter manufacturers in Canada. If your filter multi-port valve is leaking then your pool is losing pressure and water and the filter will not work as well as it should. This will result in poor circulation and poor water quality. When the pool has poor circulation this can damage major parts of your pool equipment such as the pump and heater due to a lack of water caused by air build up. Prevention is always better than a repair bill.