Auto Purge nute tanks

TheWinter

Active Member
I need to find a way to auto-purge my two 70 gallon reservoirs. Pulling two 70 gal res. every two weeks is getting hard on my back.. I have a pump, which I COULD use to pump the water out, but it leaves a good amount of water at the bottom by the time it starts sucking bubbles. How do others do it here?
 
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