Permutit scale inhibitor cartridge

[bof]

Just replaced a Permutit scale inhibitor cartridge, and after 24hrs tapping the cartridge I can still hear the polyphosphate balls rattling around, as though water hasn't got into the cartridge. I've replaced them before but never checked to see how long they take to fill.

Anyone know how long's normal? I don't want to be running the boiler for too long if it's defective.

On a second note I guess they work by the change in water pressure, as taps turn on and off, slowly pumping the solution out, any one know if this is so?

[YAPH]

If it's the metal can type they're crap: the tiny waterways in the brass connector block up with redeposited scale-inhibitor salt (almost as if they'd scaled up!). You can clear them out with a 2.5mm drill bit (they really get too hard to poke out) but they're likely to block up again in a few months. I've stopped fitting them and now replace existing ones with SFWH1s from Screwfix (code 20351 iirc).

[bof]

Thanks, 48hrs on and it's still rattling, I'll try a poke with a 2.5mm drill bit

[bof]

Yep, did the trick cleared out the two holes each on the can holder and the pipe fitting, and seems like its working again, certainly filled up quick though it still rattles a bit