Reef Angel Forum

Hi,

I wanted to get your opinion on an idea I have for an automatic water changer.

I currently have 3 pumps. One is my normal ATO and comes from a large barrel of RO/DI water. I have a second pump coming from a large barrel of saltwater and a third which pumps water out of my sump and into a drain.

I currently run my ATO using one of the 4 level sensors in my 4 channel level sensor.

I was considering the following:

During the hour from 0100 to 0200 hours I would disable the normal ATO.
From 0100 to 0115 I would run the drain pump until the level sensor read less than 50% (I normally run it at 75%)
From 0115 to 0200 I would run the normal ATO program, but using the saltwater pump instead.
At 0200, normal ATO operation would resume.

By basing it on time and levels like this, I don't need any flags. I think it would work properly even if the controller reset at any point in it.

Do you see any problems with this scheme?

Thanks,

Don

Best way to do it IMO.

I do something similar, but not linked to water level. The salt pump and drain pump turn on simultaneously and are calibrated to add/remove same amount of water.

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I do exactly what you do, but with float switches. ~0.66% water change automatically every evening. Not much, but enough to amount to about a single 15% water change per month. And no buckets lifted. EVER.