RODI Float Switch in Sump

[BigMax]

My RODI system is 15 ft from my sump. Rather than buying an ATO reservoir, and an ATO device (pump and switch) I'm thinking about adding a second float switch directly in the return section of the sump (one float is already installed in a large brewing vat). Other than a good deal of turbulence in the sump (pumping 2500 gph) does anyone see any issues? Have others done this with success? Could save myself $400 if it works well, also consumes less space and less stuff to deal with.

 

[nuxx Verified Sponsor]

Had our top off water in a brewing 55 gallon drum about 10 feet away.

One thing I'd worry about is "crud" getting on the float in the sump and getting stuck. I had success with Avast's auto topoff.

 

[mfinn]

My RODI system is 15 ft from my sump. Rather than buying an ATO reservoir, and an ATO device (pump and switch) I'm thinking about adding a second float switch directly in the return section of the sump (one float is already installed in a large brewing vat). Other than a good deal of turbulence in the sump (pumping 2500 gph) does anyone see any issues? Have others done this with success? Could save myself $400 if it works well, also consumes less space and less stuff to deal with.

I'm not sure I understand your question.
Are you wondering if it's a good idea to connect your ro/di unit directly to your system?
I wouldn't. Float switches can fail.
My ro/di topoff is a 20 gallon brute container and a JBJ ATO that is about 12' from my tank.
I use a max-jet 1200 to pump the water from the topoff container to the sump. All total under $100.
If for some reason the top off float valve at the sump fails and sticks on, only 20 gallons ( if it's completely full at the time) of freshwater goes into the system.

 

[exnisstech]

I think it will cause the rodi system to kick on and off for breif periods as It's only adding enough water to raise the float switch to the closed position. I have read this is bad for RO membranes but this is what I have read and didn't retain details. I did try to this once and didnt continue to do to the above reasons. I have a booster pump and it was short cycling and I just figured it couldn't be good for the pump but thats JMO no facts behind it.

 

[A_Blind_Reefer]

There can be a lot of tds creep getting into your system when short cycling a rodi unit, like using a float to intermittently add water to a sump. People do it, but it’s usually a better practice to fill a larger vessel with rodi and then connect an ato to that to feed the tank. Making a larger quantity than a cup or two at a time allows the membrane to flush a bit more and dilutes the high tds start

 

[mfinn]

I completely spaced on the tds creep and the whole short cycling issues. Blowing through di resin is another thing.

 

[BigMax]

Thanks everyone for the input!

TDS creep and problems with short cycling is not something I considered. It's great do throw a question out there and get input from the forum (you all). I'll do it the 'right way' after the feedback.....thanks

 

[thatmanMIKEson]

I would have an ato resivor with the float switch, I agree with the potential dangers of a float valve in saltwater in the sump because at some point it will fail and get covered in crud.

I think its a cool idea hooking up the r.o directly to a resivor and have it automated for refill, I know some people are doing it with success, but like others said I worry about water quality and filter degradation.

I like to manually produce r.o water its a step by step process for me but I guarantee my work and the quality of my filters this way.