You could and I'm sure it makes mighty fine drinking water. With that said, the goal of using pure water in reefs is to ensure you know what is going into the system. This is why we use ro
water. The missing chunk here is the DI
, which will bring the TDS
of your water down to 0.
Having the water go through an RO
system will be much better than tap, but you will want to get a DI
chunk on there to ensure you aren't adding more nitrates and phosphates with every water change.
Though not perfect, this should be just fine with setting up the system for the first time.