connect ro directly to gravity fed float in sump?

I don't think so, the pressure out of your ro system isn't that high, is it?

 

I would be more concerned about damage to your RO membranes. RO systems aren't really made to be turned on and off as frequently as an ATO tends to require. I am no expert on RO/DI systems but I would guess you are drastically reducing the life/filtering capacity of your RO.

If I understand correctly and you are doing this directly into your sump it also seems unnecessarily risky IMO. A single point of failure will lead to a practically unlimited trickle of water into the tank, which if left unnoticed for any significant amount of time could easily crash the system.

 

You will be replacing your ro/Di filters and DI resin about 5 times more then normal. I know cause I tried it a few years ago

 

i would be a little more concerned about the float failure... if and when it happens you have flooded your tank and signficantly dropped salinity.

 

Glad you went with the RO reservoir idea instead of directly in the sump. That could have been scary bad if things went haywire.

 

try and stick to cantainers that are known food safe. there is butt loads of info on the web to help find something. Brute trashcans are foodsafe, however im almost sure that the roughneck series is not. However, there are plenty of people who claim they get no leaching from roughneck. so i would just periodically check for phosphates.
just for redundancy i would blackout much of the res. to eliminate light exposure. your RODI should have 0tds, but i get compulsive and take extra measures.

 

I dont see what the issue is here. I have had my RO hooked up direct to my sump for a year now and it has worked like a charm. I also have a second feed hooked up to a jug that i do all my kalk mixing in and the filters have lasted just as long as they did hooked up to a reservoir.


And I may not be thinking about what you are saying right but wouldn't the reservoir be dropping just as often and making the RO kick on just as much?

 

Here are my thoughts

Hook up a normally closed solenoid to the RO feed. That way the RO only runs for lets say an hour a day at a certain time. If it is not keeping up, change it to 90 minutes and so on. You can set the timer so that it runs when you are home so if there is a leak issue, you will be home to catch it.

http://autotopoff.com/Solenoids/solenoid_c.jpg

Ditch the Eshoppes & get a good one. I have never seen anything made by Eshoppes that is any quality & would be worried if it was on my tank.