not that it's relevant to your Q watersparkfalls , but i'm reading a particular design issue that's a pet peeve of mine here
i like all the leads for the motor, float controls, and or alarm(s) to be passed through a conduit uncut to a JB, and then that conduit sealed
imho, i have not yet seen a 'septic proof' JB that can be utilized and survive a methane atmosphere for any length of time
also, a disco placed as close as possible is also a consideration
and.....i'm really really tired of holding my breath trying to get meter readings on a failed system
~S~