Sentinel eliminator filter

[Nostrum]

Does anybody use these?

the sentinel rep gave me a really good pitch on these against a magnaclean it it got me thinking.
They look ok although can't be split like a magnaclean so can't dose through them either, just wondered if anyone was using them and can review?

 

[buckley plumb]

fitted a few mate I quite like them . dose through airvent on unit or remove bottom and turn 180 degrees and fill then refit bottom. one thing which caught me was drain knob you have to remove nut and reverse and refit nut to use - think its a safety device to stop accidental turning .