Direct ATO

[BW1073]

Considering ATO direct from RO/DI with a sylenoid valve (instead of pumping from a reservoir).

Any reason NOT to do this?

I'm going to put a float switch on as a backup to prevent flooding. Just want to save space and not have another pump to rely on.

 

[reefsaver]

I wouldn't do it in fear of something failing. If it doesn't turn off, it's not going to be fun.
If your heart is set on this then I would say get a smaller ATO reservoir, and then plumb your solenoid system to the smaller ATO reservoir so that if it ever does overfill it doesn't affect your aquarium, but this does mean you continue using a quality ATO unit with a reservoir that's automated to be topped up with RODI.
Atleast if it did fail, all your stock will be unnaffected because your ATO vessel will just overfill and flood as long as it's outside of the sump.

 

[Townes_Van_Camp]

Considering ATO direct from RO/DI with a sylenoid valve (instead of pumping from a reservoir).

Any reason NOT to do this?

I'm going to put a float switch on as a backup to prevent flooding. Just want to save space and not have another pump to rely on.

I'm glad you've asked this. I've been pondering it and weighing the pros and cons both ways.

 

[Wild1]

Considering ATO direct from RO/DI with a sylenoid valve (instead of pumping from a reservoir).

Any reason NOT to do this?

I'm going to put a float switch on as a backup to prevent flooding. Just want to save space and not have another pump to rely on.

The main reason...Murphy's Law, not to mention massive amounts of water emptying into your system, or on the floor

 

[Jamie814]

Considering ATO direct from RO/DI with a sylenoid valve

Short cycling a RO/DI unit reduces the life of the membrane and increases TDS output short-term as well. Do you have a small pressure tank on your RO/DI to reduce cycling?

Any reason NOT to do this?

Potential to fail and flood your tank(kill) /house with unlimited water supply if you're not around to stop it.

I'm going to put a float switch on as a backup to prevent flooding.

I assume you mean float valve, which would help prevent a disaster should your solenoid valve or control method fail; this is also assuming the float valve in the sump for backup is rated for the water pressure and does not fail as well.

Is the solenoid valve being triggered by a float switch or optical sensor or just a timer?.....with the float valve as the backup?