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Here’s the initial design on paper: Design basis – Maintain at least 100 eels for 10 days with no human interaction.
The tank will be on a slight angle so maybe the eel poop will settle near the drain valve and will be sucked out when the valve opens to let water out.
The temp probe will connect to the PLC (programmable logic controller) and be configured to activate the cooling circ pump when the temp hits 60 and shut off when the temp reaches 55.
The drain valve will be controlled by the PLC on a schedule and will be the start of a cycle. Drain opens and lets water (and poop) out until the bottom (adjustable height) float switch activates. This signals the PLC to close the drain valve, activate dispenser to add appropriate amount of water conditioner and open the fill valve until the top float switch makes. This signals the PLC to shut the fill valve. I need to build in some fail safe conditions for switch failures so as not to over flow the tank or never start the fill cycle if the lower switch doesn’t activate for switch failure or clog, etc. I can do this with maximum durations or dual switches.
Adjustments are simple: Add or delete quantity of flush cycles to the PLC logic, raise or lower the lower float switch to adjust the quantity of water replaced per flush. This should give enough flexibility to find the sweet spot between maintaining temp and water quality.
Not sure if the filter will be needed based on flush capabilities but could be the back-up if the flush cycle fails to activate = turn on filter pump.
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