Well that didn't last long. Noticed high water in the sump again....that is, the first float switch isn't working again on the ATO. Now when I go to pull it off, the tube that is supposed to keep the top of the float switch dry has about a 1/2 inch of water in it!!! That's it...off comes the ATO again and I decide to remove the top part of the snail guard because that is a potential point of entry for water, that doesn't have a seal on it. I'm not using the guard anyway....no snails in the return section of my sump. I also decide to put in a new float switch and now include an o-ring on either side of the bracket that holds the switch. In theory the two o-rings completely seal off the entry of any water into the tubing. Hope this does it! Here you can see the two o-riings before I screw the tube back into position. Fingers crossed!