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This explains a few things.
Our Wonderful Tap water (or Things You Don’t Want to Know)
Almost all municipal water treatment facilities treat our tap water to kill algae, bacteria and protozoa before it is filtered and delivered to our faucets. Not all of the chemicals that are used get filtered out. On any given day, our tap water may contain fluoride, iodine, chlorine, chloramine, and traces of: potassium permanganate, magnesium sulfate, nickel sulfate, copper sulfate, various heavy metal-nitrate complexes, as well as pollutants such as lead, PCB, mercury, and silver nitrate. Yummy! More of these chemicals are used during the fall and spring when temperature changes cause a phenomenon called "Biannual Turnover". Temperature fluctuations cause the water at the bottom of lakes to rise, carrying silt and anaerobic material up into the water collected for our use. All of the chemicals used in tap water can be toxic to fish.
Although a good portion of our municipal plumbing systems have been modernized, nearly all of them still have old lead pipes in-line which can create deadly high-lead levels in our drinking water. The cost of replacing these pipes is astronomical, so another solution was found. Several years ago, water treatment plants started introducing a phosphorus compound into our tap water which binds to the lead in the pipes and coats them so that lead does not get into our water. Unfortunately, this has had the bad side-effect of creating rather high levels of phosphates in tap water. We have tested levels of over 0.50 parts per million in our tap water. Our test kits only measure up to 0.10 ppm, and we have had to dilute our samples by as much as ten times to achieve accurate readings! This high level of phosphates in the tap water has been a major cause of rapid algae growth in aquaria for the last few years. We lower these levels considerably by using phosphate-removal filter media in your external filter. However, every time you change the water, you actually add more phosphates to the aquarium. If the city uses more phosphorus from time to time, the algae can grow back almost immediately after your aquarium is cleaned.
Our Wonderful Tap water (or Things You Don’t Want to Know)
Almost all municipal water treatment facilities treat our tap water to kill algae, bacteria and protozoa before it is filtered and delivered to our faucets. Not all of the chemicals that are used get filtered out. On any given day, our tap water may contain fluoride, iodine, chlorine, chloramine, and traces of: potassium permanganate, magnesium sulfate, nickel sulfate, copper sulfate, various heavy metal-nitrate complexes, as well as pollutants such as lead, PCB, mercury, and silver nitrate. Yummy! More of these chemicals are used during the fall and spring when temperature changes cause a phenomenon called "Biannual Turnover". Temperature fluctuations cause the water at the bottom of lakes to rise, carrying silt and anaerobic material up into the water collected for our use. All of the chemicals used in tap water can be toxic to fish.
Although a good portion of our municipal plumbing systems have been modernized, nearly all of them still have old lead pipes in-line which can create deadly high-lead levels in our drinking water. The cost of replacing these pipes is astronomical, so another solution was found. Several years ago, water treatment plants started introducing a phosphorus compound into our tap water which binds to the lead in the pipes and coats them so that lead does not get into our water. Unfortunately, this has had the bad side-effect of creating rather high levels of phosphates in tap water. We have tested levels of over 0.50 parts per million in our tap water. Our test kits only measure up to 0.10 ppm, and we have had to dilute our samples by as much as ten times to achieve accurate readings! This high level of phosphates in the tap water has been a major cause of rapid algae growth in aquaria for the last few years. We lower these levels considerably by using phosphate-removal filter media in your external filter. However, every time you change the water, you actually add more phosphates to the aquarium. If the city uses more phosphorus from time to time, the algae can grow back almost immediately after your aquarium is cleaned.
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