Homeowner had concerns about the existing 13 year old Zoeller battery backup sump pump system. Hooked my garden hose up to the water heater and the ran main pump and backup pump through multiple cycles with no issues. Back up system seems to be operating fine at this time. Homeowner just installed a new battery on the system two days ago. Still recommend updating the system due to the age of the existing. We will be using his battery with the new backup system. Emailed copy of invoice and estimates to homeowners email.