Hey everyone i have a broken Relief Valve. I need to know the make and model of my cartridge filter in order to get the new part. All i know is it is a Hayward Filter, and the serial number is 11760. Could anyone lend a hand? Also Our pool is greener then green. I can only see a few inches into the water. Im ready to start the cleaning process but i need to know is it safe to run the filter without that Relief Valve?