Been lurking for a while and excavation is scheduled for 9/3. Gonna share my build.
Spa: Round, 7' diameter, raised 18" with 11' spillover, 1.5 HP air blower, 6 jets, 1 LED Pentair Intellibrite
Filter: Pentair Clean and Clear Cartridge 520
Filter Pump: Pentair Intelliflo VS 3HP