I am going to change my basement sewage pump this weekend, and would
like to have some expert opinions on the following questions:
1. The flotec pump instruction says to install check valve
horizontally, not vertically, citing the possibility that solids
sitting on the valve. The diagram the user's manual shows that the
check valve and shut-off gate sit right on top of the sewage basin
cover. My concern is, that installation (as described) will make it
difficult to change the sewage pump in the future, since there is no
easy way to life up the sewage basin cover! For that consideration, I
would rather install check valve vertically. What do you think?
2. Is a "Union" needed below the check valve if I use the rubber sleeve
check valve? My understanding is, the only reason to have a union below
check valve is to make it easy to disamble pipe and replace check valve
and/or pump. Well, since I use rubber sleeve check valve, it is already
easy to install/remove, so do I still need a Union for any reason?
3. My current sewage basin cover has about 1/2 inch layer of some type
of clay/soil on it for sealing purpose. The material looks like normal
soil, but it is light weighted, yellowish, can be hand grinded into
fine power (thus will not clog pump if getting inside). I think it is a
special type of clay sealant with some chemical in it, so that when it
dries, it expands to fill all the cracks. Does anyone know what
material that is?
I really appreciate any of your inputs on any of the questions!