Welcome to TRT!
I used a similar sponge before, it did work great!
until one day I got home and I had a dry sump and burned out my sump pump, not to mention all the work of cleaning up 15 gallons of salt water off the floor...
I had to check mine 4 times a day after that... and finally I just took it off and would rather put up with the sound then deal with the sponge anymore...