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Hi Darrel You are right. Here is the brief description of the method which I use: The results in mg/L COD are defined as the milligrams of O2 consumed per liter of sample under the conditions of this procedure. The sample is heated for two hours with sulfuric acid and a strong oxidizing agent...

Thx Darrel i have managed to convience my wife and from more then two weeks, filter is running non stop 24/7:) CODs are being measured in the lab in the company that i am working for. Im using a spectrophotometer to determinate it. All the test methods used in the labs are validated according to...

Unfortunately I have lost all my guppies now... and I have started loosing my Tetra Neons now. There is 11 of them in the tank now. 2 b Here are my recent test results: pH 7.1 (evening measurement) pH 6.85 (morning measurement) Water Temp. 26.5 NH3/NH4 - 0 ppm NO2 - 0 ppm NO3 - 10 ppm COD's - 35...

I would like to say big thank you to all for very helpful posts! Female Guppies are better now, started swimming normaly. Male still stays in one place, refuse to eat again. Will see if he will get hungry today. If not then I am afraid he wont take it much longer... BTW. Filter was left switch...

Nope not at all. I have only changed around 10% water twice. The area where I live (West Yorkshire), got pretty hard water. It says on YW website: "The water supplied to the zone is classified as being slightly hard to moderately hard water, which is river/reservoir derived. As we have a...

I've done few test today: Refractive angle: 3.368 same as DI water Conductivity: 144.5 uS COD's (Chemical Oxygen Demand): 42mg/l Anyone could help interpreting these results?

My air pump is on all the time. I will measure the COD's tomorrow. Just to mention this again, this started happening almost stright after I have introduced my Neon tetras.

Dear All I am new here. Let me introduce myself. My name is Lucas and I have set up my "low tech" tank at 6th of November. Here are some details about my tank: - 60l tank - 11W light ( I know its very poor, but thats how I got it with the lid, I am planning to upgrade it next week by adding...