Can someone please help me im a girl don't know a lot about pvc fittings and stuff. So i have a 18 inch intex above ground pool i want to hard plumb to Hayward sand filter. So i have no idea what size pvc I need what adapters or couplings i need please some one tell me what to get what size and anything else u care to share with me I would greatly appreciate it . By the way the pool has the two lines that go into a tee also .Thank u berry much?