How to automatic mixing water

[sphelps]

You don't need to match pumps if you use a float, I posted an explanation earlier involving a slow fresh water top off and a fast saltwater top off. Using such a method will result in stable levels.

As for conductivity probes they do fluctuate in my experience as well but with the right controller you get use to quickly adjusting the calibration/set points on a weekly bases to maintain consistent salinity.

[Lance]

Originally Posted by lastlight

So do you guys think it's ok to have a 200g reservoir of ready-to-go saltwater on hand? Let's say it gets fully used up in a month...

IMHO, The saltwater should stay fine for quite a while providing it has some movement via PH and that it is stored in the proper container and cannot absorb anything harmful from the air of the room it is stored in.