None.
How do I check or change my filter on my fresh water well?
tap water will make your plants grow faster because it contains ions such as magnesium iron gases calcium carbonate and minerals.There is some purified water that will also make your plant grow only if it says it has minerals and if it doesnt its better to use tap water and its cheaper too.
Flagellates are found in fresh water as well as in salt water, sewage, and stagnant water.
well it can die if its a salt water shark in a fresh water lake, but if its a fresh water shark and its in a fresh water lake it will live.
Ocean water Can't drink it and its salty. Fresh Water can drink it, because its fresh :D!
Fresh water fish survive just as well as fresh water fish. Maybe this question isn't the one that you actually meant to ask?
Fresh water? Well most fresh water is frozen in polar ice caps. But the largets fresh water lake is Lake Bakal in Russia. I do hope you meant freshwater.
Well water
well you just do who knows?
The deeper the well the bigger chances to hit salty water. Fresh water is usually close to the surface as the ground water table varies with elevation.
aquifer
Well it depends on the fish. If it is a fresh water fish then it lives in fresh water, salt water fish live in salt water.