Waterproofing a basement before finishing it
Always start outside, where the water is. If you're even slightly up-hill in any direction that doesn't affect another property. Then, Grading &amp; Sculpting the land will never be outdone by any other system &amp; it's free to operate with no maintenance in your lifetime. No back up battery, no back flushing &amp; no worry.

Other than that, where you have no drainage area or direction then still treat the outside to keep the building dry &amp; especially free from being eroded. Handling water after it comes in means you're only collecting it after it's done it's damage. Would you wash &amp; wax your car that was run over by a trash truck?