powerhead juwel 1000 eccoflow

Hi all, I have a few filter quandaries and could really use some advice. I currently have 2 Juwel tanks (120L and 110L) and use the eccoflow 500 filters that came with it. I also set up the spongers as shown in their instructions. Both filters have started stalling a bit, one a lot more than...

I'm after one of these to upgrade my rio 240 which currently has a 600.    Has to be an eccoflow version not the old juwel 1000 powerheads or won't fit in the new tank i don' believe.    I'm in Sheffield but happy to pay postage obviously.    Thanks