Pondmaster 1250 problems

Hello, as you can see in these 2 videos: 

My pondmaster is not sucking up any debris in my tank. My tank is 8′ x 5′ x 16″ and has 300 gallons of water with 1000 pounds of epsom salt (specific gravity 1.25 or so — much higher than an aquarium):


This pondmaster was recommended to me by tech support, yet it is not doing any cleaning.

I did have to put rocks in the input tray of the pondmaster to weigh it down:

So I’m not sure if that is reducing the input suction significantly.

Any help on getting this to work is appreciated,
Terrence Brannon

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