Best choice for hang-on type auto fill device?

[shellsingleton]

I need to install an auto-filler to provide makeup water from evaporation while I’m out of town. There are a few out there, does one work better than the other?
I’m speaking of the type that hook to a water hose and hang over the side of the pool, not installed similar to a skimmer.
Thanks!

 

[TexEdmond]

Following, also curious.

 

[pmahosky]

Following.

 

[jark87]

Could it be something as simple as this? https://www.amazon.com/Orbit-62061Z-Single-Programmable-1-Valve/dp/B004INGS8S

I have a sprinkler station plumbed into the pool for fill water. I don’t have a float or anything that measures water level, but if we’re out of town for an extended period of time during the summer, I’ll program the sprinkler station to fill for 15 minutes once a week. That gets me 3/4 - 1” of water in the pool, which is enough to keep up with the evaporation (with the chiller off) - at least enough to avoid a water level problem. Yes, if it rains there’s the possibility of overfilling, but the overflow drain takes care of that.

Seems like a hose connected to a simple timer could accomplish the same thing.

 

[shellsingleton]

I had thought of that also. It may have more advantages than an auto-fill device. No chance for a pressurized hose to leak, no float mechanism to get stuck. A hose into the pool would be less obtrusive than the auto fill box.
Cheaper and they have been making them for a looong time. You just need to figure out how long/often to program it to flow.

 

[jark87]

One other thing I do prior to an extended trip is to add a heavy dose of MA. My pH rises fairly quickly so I lower it to accommodate for the rise while I’m gone.