1. Hard S40 1.5 PVC -- no 'flex' -- to/from each fitting and fixture, bedded fine gravel. Bring the all to the pump location, and header then together using 2 x 1.5 fittings
2. 1.5" for the 'homeruns'; 2" for the header (joining pipes).
3. dunno
4. dunno
Ben
Bookmarks