Float Valves on sump tank

[jimnrose]

I'm lanning to use a float valve (Eshopps) for the ATO on a sump tank. The valve assembly will be about 4" above the water line and the ball tipped down to the water. I have heard that 'salt creep' will cause failure. Will this happen if on ly RO/DI water in inside the valve and the flex joint is above the sump water level?
If there is a risk, is there any type of coating or shield that could be added to the joint that would be chemically safe? Jim

 

[reeftivo]

I was going to use a float valve as well but read of the same troubles. It spooked me so I went with the Tunze osmollator with static sensor and have no regrets.

 

[E.intheC]

I've heard of people using all sorts of covers for their ATO switches, including plastic pill bottles cut to size.

Check out autotopoff . com or bulk reef supply. I believe their units come with covers.

I'm going with the Reef Keeper Lite with ATO for my Solana.

 

[jimnrose]

I've checked out these options that have electrical components but I have a gravity feed system and am trying to stay with a simple mechanical float valve. The feed from the RO/DI will have a solenoid & timer to reduce the frequency of turning on the RO membranes. The feed from the RO/DI to the Sump will bea direct feed which will be dependent on the float switch. If it's a salt creep reliability issue then I'll try to mount the valve as far away as feasible. I monitor the 'salt creep' as part of a maiintainance schedule.
I don't have any idea of how much waater evaporates each day. I have a 125g display,a 29g sump & 29g fuge but the return section of the sump is only 8 gallons (0.5 gallons /1").
I'm guessing an evaporation of 3 gallon/day but that''s only a guess. Does anyone have a guideline based on 80F water & 76F (A/C) room temp? Thanks, Jim,