i have been looking at a HMA filter such as this:- http://cgi.ebay.co.uk/HMA-CBR2-METAL-RE ... plies_Fish.
when i asked for information on this at practicalfishkeeping.co.uk i was pointed in the direction of this:- http://www.evolutionaqua.com/acatalog/D ... ators.html.
now, going for the smallest one (12 inch) it says it is good for up to 150000L, so by my calculations will last 19 years with 150L a week water changes.
so here are my two questions:-
1)surely this is too good to be true as i thought activated carbon when used in a filter became "useless" within 4-5 days, so wouldn't the same roughly apply here?
2)isn't this just a tube with high grade activated carbon in it? these are £65 to buy. wouldn't a DIY job be quite easy? like building a co2 reactor for example, thats all it looks like to me.
any thoughts welcome
when i asked for information on this at practicalfishkeeping.co.uk i was pointed in the direction of this:- http://www.evolutionaqua.com/acatalog/D ... ators.html.
now, going for the smallest one (12 inch) it says it is good for up to 150000L, so by my calculations will last 19 years with 150L a week water changes.
so here are my two questions:-
1)surely this is too good to be true as i thought activated carbon when used in a filter became "useless" within 4-5 days, so wouldn't the same roughly apply here?
2)isn't this just a tube with high grade activated carbon in it? these are £65 to buy. wouldn't a DIY job be quite easy? like building a co2 reactor for example, thats all it looks like to me.
any thoughts welcome