In my basement I have a sump pump that pumps up about 6 feet to the outside away from the house. That pump does not have a back flow value which has caused me no problems. Any water flowing back has been less than a gallon. During the worst rains the pump operates for 40 sec every 15 minutes.
I just purchsed a Watchdog battery operated backup sump pump that I am getting ready to install. I will be tapping into the existing outflow line which is a 1 1/4\" PVC. QUESTION: I purchased two back flow valves to put in but do I really need to install any?? I am concerned with water standing in the line durning the months that the pump isn't used and also concerned with it freezing during the cold days durning the end of winter and beginning of spring.
Any help you can provide would be greatly appreciated. Thanks in advance.
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