Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: If the primay pump fails will the back-up pump start to prevent water from overflowing?
Document: quiet easy to install.also have wayne ejector pump.they work great.do recommend for anyone looking for a battery back up sump pump.
It was easy to install, even though it did not have specific instructions for the combo pump. Working well so far and the tests I've run on the back up pump are fine. You will have to spend another $200 for a sealed battery.
I did not have to adjust the battery backup float due to the depth of my basin, but if I would have had to it can be done with minimal trouble. When the float was activated the backup until kicked in and pumped all the water out. I gave it 5 Stars. Now to wait to see if it works when I really need it to...I did not add a "no-clunk" check valve. This pump will not run that much.
This pump is a beast! Even the plumber loves it. We live in a wetland, and really need a good sump pump. The Wayne 1/2 horse primary and 1/3 horse backup are everything we'll ever need to stay away from torrential rains. We also bought a sealed, 32-hour backup battery, just in case of power failure. No messing around with battery acid, or monitoring water levels in the battery.
I unplugged the main unit, filled my pit with water, and viola!-the battery kicked on, sounded a brief alarm, and pumped everything out. The whole outfit cost over $560 with battery and shipping, but for the peace of mind I have and heavy duty equipment, it was well worth it.
The backup pump still worked fine though. I'm going through support to see if they will send me a new one.
I have an outlet on the wall above the pump that is oriented sideways and the transformer is so heavy it literally falls right out. This is obviously nothing an extension cord can't handle, but it annoyed me enough to mention.
I tested it using the battery I already had. The alarm  give a moderately loud beep when the pump kicks on. It's not excessively loud and you probably wouldn't hear it upstairs unless the house was quiet.
After contacting Wayne's customer service they linked the  problem to a faulty charging panel on the outside of the battery box. They promptly sent me a replacement charging panel and the  pump works fine now.I am very  satisfied with its performance. This pump is unbelievably quiet with it's two built in check valves that you don't hear the pump operating at all unless you are in its proximity.
So I rolled the dice, read the reviews and bought this unit...It is expensive but cheaper than paying an insurance deductible and the hassle of the mess.Installation was fairly easy with basic plumbing experience. Make sure that you have a 15" diameter sump to set it in. Both the main pump and the backup pump worked when tested. Each separate unit feeds into one discharge pipe.
Answer: yes