Fitler Sponge\neon Tube

[andyboy!!]

Hi

How often should the sponge in the filter be changed.

I know you should only change half at a time but how often shouls this be.

I clean it about once a month in the agreed way

Also, I have read that the neon tube should be changed every year, even if it's still working fine. Is this essential and if so, why?

Cheers
Andy.

 

[Chri$]

What type/make of filter is this?