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Why can't I prime my new canister filter?

Subject: Why can't I prime my new canister filter?
by Fishyfishfish on 7/8/2019 16:46:47

Hi there

As the title states why won't it prime? It's a Oase Biomaster Thermo 250, all connected up correctly and you push down the large 'button' on top of the pre filter to get it to prime, but no matter how many times I do this the water just won't circulate through.

Both tubes have got some water in but when I push the button the water moves a little then just goes back, it just doesn't want to go any further. The filter is on the floor so well below the water line, and I've tried moving the filter to displace any air but it just won't do it.

Is there anything else I can try?