
Originally Posted by
Polkster13
As GaryP is so fond of saying, "The solution to pollution is dilution".
Did I say that? Really? 
If I did say that, please don't tell the EPA that I did. In most industrial situations, dilution is considered an illegal form of waste treatment. I don't want to be the reefer equivalent of the bird man of Alcatraz.
Seriously though, what I was referring to was the use of water changes to dilute pollutants with new water. The problem with that though is that is is very inefficient and takes multiple large water changes to make a serious impact. For example, a 1.0 ppm phosphate level is only reduced to 0.9 ppm by a 10% water change. If someone did a weekly 10% water change and there was a weekly increase of .1 ppm of phosphates as a result of feeding, then there is no net decrease in the phosphate levels. On the other hand, large water changes such as a 50% change, can cause other more serious problems.
I am not putting down the importance of water changes, but rather I am saying that they should only be one part of a more comprehensive water quality management program. In other words, water changes are a tool, but its not the whole tool box.
Gary
125 SPS, 75 gal. LPS/softie reef, 9 gal. Nano