I have my reef-pi doing AWC for me.
Disables my ATO, pumps water out the last compartment of my sump till it triggers a float switch to protect the return pump. Then fill sea water from container until the normal running level float switch is triggered. Then turns AWC of and ATO back on.
Disables my ATO, pumps water out the last compartment of my sump till it triggers a float switch to protect the return pump. Then fill sea water from container until the normal running level float switch is triggered. Then turns AWC of and ATO back on.