hi mate
it sounds like you might have a massive airlock in the pipes, i have a filter very similar to yours you need to empty the filter and start again but using your sucking power to draw the water into the filter, once full start the motor if you hear a hissing sound shake the filter to get rid of the air thats near the impellar.
hpope it works and sorry to hear about your back problems i know how you feel.
mick
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