i had phosguard that i had purchased about a year ago so i through that in a sack and am going to leave it in for 4 days see what that does
I just read a great article about this, Placing the phosguard in a sack will do little to nothing for your tank, the water must run over and around it.
With that said, if you have a sump, you could place the sack over under the flow or you can pick up some bridal veil from a fabric store, get a small plastic basket, place the bridal veil than the phosguard, place it under the flow.
If you do not have a sump, you may want to consider another route like Farslayer & craig7220 mentioned.
Hope this helps,
Kaye