beaslbob":2llcg56h said:gpodio:
Sure.
Chlorine is a gas the dissapates rapidly out of the plumbing.
chloramine is a liquid which breaks down rapidly outside of the plumbing. And breaks down to chlorine and ammonia. The ammonia is rapidily consumed by the plants.
The plants rapidly bioaccumulate any heavy ions in the water. For instance, a marine macro algae rapidily consumed copper in lab tests. So rapidly that 1/10 pound (wet) of the algae consumed copper at or higher then 90% of the at faucet levels in US major cities in two weeks in a 55g tank.
Additionally, the dechloriantors and ammonia blocks also lock up oxygen. People using them plus my experience is that when used according to instructions they can and will crash the pH and kh.
The theory is there... but plants are not fast enough at consuming trace elements to clear up any "problem" values before they harm the fish exposed to them. If you were treating the water in a plant only tank prior to use this could work, but chances are if this is working for you, your tap water isn't that bad to cause problems in the first place. Plants will improve the quality for sure, but if the water is dangerous to start with, fish will likely be effected before the plants can do anything about it. Two weeks is certainly doable for plants, but fish won't wait that long in bad water...
My tap water is quite soft and relatively high in heavy metals for instance, I wiped out an entire population of SA cichlids doing a water change without my usual conditioner that also took care of heavy metals.
While it's true that conditioners do consume oxygen, I have never witnessed any ill effects from using them, when used properly. I have been using Tetra Aquasafe for the last 10 or so years, I usually dose twice the recommended amount as I fill the tanks directly from the tap. I don't know what product you've seen crash PH but I haven't seen any of the products I use effect PH or KH.
PS. Chloramine is quite stable once diluted... that's it's key advantage over chlorine.