Quote Originally Posted by GoVols View Post
So it doesn't have a diaphram style pump? Does it actually have a serviceable impeller?

Ours does the same. I was told adding a vented loop to each toilet should do the trick. I contacted Raritan and priced the vented loop at ~$100 each.
i got my 1" vented loops on e-bay for 10.99 with free shipping, their plastic but work great