frost depth and sump pumps

I assume you want to pump out sludge. Some questions you need to answer first:

1. Where and how are you disposing of the sludge? If you're planning to bury it, you have to ensure that the maximum level of your water table is not less than 3 meters below the bottom of your burial pit.
2. What do your local Environmental & Public Health protection codes say about this matter? If your local codes forbid disposing of the sludge yourself, it'll be best to engage a professional waste disposal company to deal with the matter instead.
3. What is the volume of sludge you want to dispose of, & how fast do you want to pump it out? Is there any code of practice in your area pertaining to this matter, or can you set your own? Dividing the volume of sludge you want to dispose of by the maximum amount of time needed to pump it out will give you the minimum required pump volumetric flow rate. Of course, you should always follow your local codes unless there isn't any.
4. What is your required head? Multiply the density of your sludge by the its depth to find its pressure head. Comparing your required flow rate against your required pressure head on the pump curve will determine the pump to use.
5. Is there any local CoP regarding pipe size? Generally speaking, for domestic sewage, you'll need a Ø4" pipe.

I hope you find the above helpful.

Not pumping sludge . Im pumping water from spring thaw.

See previous discussions.

Thank You Anyway.