I saw a water powered sump pump on TV and it was used as a back up to a powered sump pump. I have had pumps fail and this would have been cheaper then replacing carpet etc.
Agreed…They do waste good water, pumping the waste water out. So I wouldn’t reccomend them as a primary system. But for a backup system they make terrific sense. Around here, we loose power all the time durring major storms. That’s when you need the primary pump the most. Running these off the water supply when there is no power to the home is awesome. I reccomend them routinely as a backup.