OrganicRusty wrote:Assuming this setup works out can I just add unconditioned tap water during my partial changes without damage to turtles or filter biom?
I too questioned this wisdom that water treatment is bad. I'll try to answer your questions, but first, what I've done is to pull the carbon fro. The filters because I have plants and was concerned about the carbon adsorbing some of the nutrients the plants needed. I don't treat my water, but use this instead
viewtopic.php?f=9&t=33171I also have shrimp, which would be much more sensitive than fish or turtles.
If you just have a turtle, and you have a lot of carbon in the one filter and a well established biofilm, using straight water should be fine. Part of the danger of chloramine is to fish breathing it in via their gills. Your turtle is just drinking it, like you.
Chloramine is added to kill bacteria in the water supply, but a well established biofilm is much more resistant than free floating bacteria, and your carbon will break it down.
As to safety, I'm not sure it's in the really bad category. However, you are basically adding a sulfur salt. SeaChem prime uses sodium thiosulfate. It's marketed for fish. If it were killing fish, people would have complained.
On the other hand, dumping tons of a salt doesn't seem natural, and turtles live decades not years like fish. To me, since there are alternative ways of dealing with it, I ultimately decided to err on the side of caution.