The aquarium idea is a good one.
That's what I thought, too. My only saltwater tank doesn't really have a nitrates problem - only maybe 2-3 ppm - but I was thinking that since nitrates are non-evaporative, what if I keep the water from water changes and let it evaporate to boost the nitrate content? I want to test with a higher concentration, like 20 ppm so I have a longer period of time to determine how fast the sand bed is working. I'm worried that with only a few ppm that all the sand beds will knock it out too fast. Also, my testing kits only measure in increments, not exact measurements. So would evaporation do what I want?
That's what I thought, too. My only saltwater tank doesn't really have a nitrates problem - only maybe 2-3 ppm - but I was thinking that since nitrates are non-evaporative, what if I keep the water from water changes and let it evaporate to boost the nitrate content? I want to test with a higher concentration, like 20 ppm so I have a longer period of time to determine how fast the sand bed is working. I'm worried that with only a few ppm that all the sand beds will knock it out too fast. Also, my testing kits only measure in increments, not exact measurements. So would evaporation do what I want?