I know someone is going to say who cares P but...
Would a DSB work on a fresh water tank?
Would a DSB work on a fresh water tank?
Copper,
Yes, it does. I have had a FW DSB in a mixed tank for over a year. Only thing though, as soon as you go planted aquarium, then remove the DSB as the plants need Nitrates.
I paid about R350 for a standard 3ft aquarium at the LFS. About R50 for two pieces of 4mm glass for a baffle to seperate return pump chamber from DSB. And about R30 for a tube of silicone.
I bought two 30KG bags of play sand for about R20 each.
And Violla, I DIY'ed.