I had always heard that tobacco filters were loaded with chemicals - made with things that were harmful. I have no idea if this is true, just was always told this, do any of you know what the filters are made of or if there are chemicals in them? Thank you for any info, want to know for sure before I give them a try.
Darlene
Filters that originate with a cigarette - sure. Aftermarket filters - probably not.
I use Fluval. It can be tricky. I dissected my 510 filter and cut a bit of fluval to the same size. A little goes a long way. The good thing is that one box of fluval glass polishing stuff will last a year or more
You may want to look up the coffee straw mod which is around here somewhere. How you do this is get a simple coffee straw, cut it at a 90 degree angle then cut the other end to fit inside your cartridge. You want the flat top of the straw facing up, about 1/8th of an inch below the top of the cartridge. It will not melt. Then, settle your fluval around it and fill.
The straw will funnel the liquid to the bottom of the cart, which means you can fill the whole thing more efficiently. You also don't need to fill as often.
There are detailed instructions for this somewhere around here in the DIY section

Probably the mods.