All the specifications are detailed. Nowhere in the writeup do I see any mention of saltwater application for this pump. Here in the states we are accustomed to seeing our ponds in freshwater, not saltwater. Are you sure this pump is going to be appropriate for your seawater system? I'm doubting it.
Beautiful build. I've been tagging along since day one and I'm mighty impressed. Thank you for sharing the build with us, not just the 'pretty, shiny, end result'.
FYI, you might want to consider the Reeflo Pumps, specifically the Manta Ray Gold. 1-1/2" in/out, it is pressure and flow rated. Commercial Duty pumps come in 1HP, 1.5HP and 2HP.
Good luck,
Russ