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I just bought a new home and am trying to get familiar with the equipment. There is a Hayward C12002 cartridge filter with a design flow rate of 120 GPM. I cannot find a brand name on the pump other than the motor is a 1.5 HP Marathon so I have attached a picture to see if anyone recognizes...

Newcomer to the forum here. Does anyone have a clue what this substance is on my pools walls? It's green, hard, and gritty and seems to be imbedded into the plaster. I have tried scrubbing it off with a steel brush to no avail. Since the attached picture was taken, I have added water (low...