TDS creep by design in mixing station?

rseleri

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I'm planning on building a mixing station.
took a few days to learn, read, watch videos and I think I figured it out except one thing.
in all the stations i see, one puts a float valve at the top of rodi container which is connected to a feed line from the rodi system and auto shutoff valve.
ok, now, in the event of just getting some pure ro water from the mixing station in order to fill the tank ATO container, wouldn't the float valve in the mixing station will kick in, draw small amount of water from the ro system and stop?
and in that case, one would evetually get a tds creep and make his membrance go bad fast?
Why I dont see mixing stations using optical sensors and solenoids? is there any reason?

Thanks!
 

KStatefan

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I use High/Low tank controller to run my RODI system. Makes about 25 gallons each time.
 

gbroadbridge

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Why I dont see mixing stations using optical sensors and solenoids? is there any reason?

There are devices that use optical sensors to control RODI.

I use one to keep my ATO reservoir filled 10 gallons at a time.
It only refills when almost empty.

This way I never have to manually fill the ATO.
This is what I use:

 

Mark E

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There are devices that use optical sensors to control RODI.

I use one to keep my ATO reservoir filled 10 gallons at a time.
It only refills when almost empty.

This way I never have to manually fill the ATO.
This is what I use:

I can think of a few reasons…

Cost… optical sensors cost more!
Accuracy - frankly you don’t need it, a mixing tank is a huge volume, you’ll check the salinity anyway, so why pay for a more accurate sensor?
Reliability - there’s nothing in RO to clog up a float sensor (unlike salt water) so why pay more for a sensor with no moving parts?
 
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