qkat - does your compressor have a pressure gauge. If so what does it read while the system is running? Generally if one diffuser is a little deeper than the other one, I suggest the valve of the deepest diffuser be wide open. Then open the other valve and allow the diffuser to boil as hard as you want. This method utilizes all air and minimizes back pressure.
For operating times - first I need to what is the cfm rating of your compressor??
Biochemical oxygen demand is a measurement of the amount of dissolved oxygen that will be consumed by the respiration and decomposition of organisms and organics in the water column during usually 5 days or some specified time period. Basically aerobic decomposition and respiration or the living organisms or the oxygen (DO) that pond water needs to sustain life. The more eutrophic a pond is the higher the BOD measurement becomes, thus the more DO it needs to keep things alive.
Wikipedia describes it as: amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period. The term also refers to a chemical procedure for determining this amount. This is not a precise quantitative test, although it is widely used as an indication of the organic quality of water.[1] The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of sample during 5 days of incubation at 20 �C and is often used as a robust surrogate of the degree of organic pollution of water.
Last edited by Bill Cody; 07/26/13 10:40 PM.
