>The most fragile part of the system is probably the pump. Most submersible clean-water pumps don't require lubrication and have very little wear as they use f

>The most fragile part of the system is probably the pump. Most submersible clean-water pumps don't require lubrication and have very little wear as they use fluid bearings. They usually last at least 8-10 years without any maintenance as long as you follow the specs - avoid running dry, starting/stopping too frequently, particles that are too large etc.