"Dean A. Markley" wrote in message
...
sew crazy wrote:
is gluegun glue toxic to fish ....
I am moking a filter and need to glue some stuff befor i put
silicone(marine) ....
Speaking as a chemist, most hotmelt glues would be perfectly safe.
However, I would ask, what type plastic are you making your filter from?

Dean

Perspex and two undergravel plates ...

The thing has two compartments one solid 2 filerplates and a solid bottom
and sides

the undergravel plates form a compartment between them and the water from
the tank go in the back compartment thus allowing the water to run through
some filterwool to get rid of the big stuff ...
the two pumps that feed the main tank delivers 300 gph each thus I have
about 500 gph coming through the "prefilter" which now sits in my sump. this
handles the flow nicely - will see what happens once it gets dirty and how
often I have to replace the wool ...
hopefully not often as the undergravel plates I used is 18" by 24" each
in the main tank I have a canister filer doing another 500 gph but as this
does not go through the sump that water is no problem

Since the stuff sits mostly below water with about 1" sticking out strength
is not really an issue it just had to hold
I ended up using hotmelt just to tack the stuff and silicone to "seal" it
all.
the end construction is very sturdy ... so it should hold.