Got most of the perimeter plumbing installed, allowing me to move the reservoirs back into position. One observation from this: if you like nice neat straight lines in your plumbing, don't order 20' lengths of schedule 80 from a commercial construction supplier. This was the most warped, beat up and generally homely pipe I've seen. I'm pretty sure my blood pressure went up several points and/or I'm talking to myself even more than I used to after fighting to get 160' of it on the walls in somewhat straight lays. It boiled down to a laser level, pipe clamps, and brute force. I'm doubly glad I had the walls backed with plywood to allow for strong clamp mounts anywhere and everywhere.
Perimeter Plumbing Started
The especially crooked bits at the ends will be straightened out with additional clamps after the termination fittings are attached. A base cabinet with counter top will be installed on the right wall to hold all reactors and potentially a cryptic zone tank or refugium.
RO/DI and Salt Mixing Tanks
As a reminder, the small cone bottom tank is where I'll dump in the dry salt. This is to save me from having to schlep 60 pound buckets of salt up a ladder to pour into the 6" wide top opening of the saltwater reservoir. Instead, I will dump the salt bucket into the lower, wide-mouth cone tank in the middle, turn the valve below the cone to allow water to flow up into the mixing tank, then turn on the high power pump to draw the salt slurry and pump it up into the main reservoir through an eductor.
Unglued Prototype of Water Change Tank Plumbing
Starting trying to work out how the plumbing will work for the mixing station.
Things are going to be very tight, as this photo has only the pumps for the saltwater side. Plan calls for 2 pumps on each reservoir: one high power and one low power: high power will be used for mixing and for transport from RO -> Salt reservoir, low power to feed the UV reactor on each reservoir. Reason for the separate pumps is to reduce power usage and noise. Only the low power pumps will run continuously.
I wish I felt more confident that this will work as planned. I have a concern that the head pressure of the main reservoir tank will overcome the suction of the mixing pump: in other words, when I turn on the mixing pump, instead of drawing the slurry in and draining the cone bottom tank, it will just recirculate the main reservoir while the cone tank continues to fill and overflow. If this happens I will have to find a way to fit in another valve between reservoir and mixing pump, before the cone bottom input.