It is also possible that potassium and magnesium have direct effects on bone cells. Good sources of potassium include bananas, oranges, tomatoes, potatoes, broccoli and melon. Good sources of magnesium include fruits and vegetables, milk, fish and whole grains. Chlorine levels recommended for swimming pools and water parks may not be high enough to kill Cryptosporidium parvum , a parasite that causes diarrhea, according to ARS experts. This single-celled organism is transmitted in the feces of infected people and animals.
Infection occurs by swallowing oocysts.
Cryptosporidium has caused numerous recent outbreaks in recreational water, such as swimming pools and water parks, often visited by diapered children. When the water contained this organic matter, currently recommended levels of chlorine did not kill the parasite. That's because organic material deactivates some of the chlorine. Previous tests showing that recommended chlorine levels are adequate had been conducted in clean water. Based on the ARS findings, the CDC suggests changes in engineering of public pools and water parks, such as improved filtering and more frequent turnover of the water.