Heyho.
i reached the limit of u4.
unfortunstly the wster well on the map cant be leveled up to lvl10
im using mk4 pipes and made a water loop ( Input > prpduction + nuclear > input ) my big issue is that nuclear reactors have 3 inputs and the pipe busses cant deliver the needed amount for the hole factory.
also the game has crazy 5 mins long performance lags after each autosave
Many water cycles can be closed with reprocess water (like consended steam) routing back inside of each separate block. 1 FBR or Nuclear II needs only 96 of water/minute at full power - you get 75% of water back with big cooling towers. So 1 pipe II can supply 2 of these. This also makes pipes shorter and thus cheaper in maintenance.
I'm not suprised you have lags given how that hole complex looks like...