Bioload Water Change Sump

[bioload]

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In the planning stages of my next project which will include a redesign of my sump. I would like to simplify water change tasks and would like thoughts on what I have in mind before I get too far into the build. The sump will be for a 75gallon tank that will allow for ~5-6gal water changes roughly 6-8% of the water volume assuming that the water in the sump will even out the displacement of the rockwork in the display.

I would like to keep the footprint within the standard 48” x 18” design, and incorporate an RO/DI reservoir and freshly mixed saltwater with circulation and heating. Here is what I’ve come up with so far:



Assuming that there is saltwater already mixed I’ve put together a sequence of events that would complete the water change….the times and durations will need to be determined of course.

1. On – FSW circulation and heater (hours? in advance to prep for water change)
2. Open – Return pump drain valve
3. Close – Return pump drain valve
4. Off – FSW circulation and heater (prior to transfer)
5. On – Transfer Pump (Size?)
6. Off – Transfer Pump
7. Dispense salt mix prior to next scheduled water change

The saltwater mixing tank will be filled the next time the RO/DI reservoir cycles, and level kept constant. The RO/DI will cycle every 3 gallons (too much?).