Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size. With a positive relationship, these limiting factors increase with the size of the population and limit growth as population size increases.
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Many older properties have cold water storage tanks in the roof space or loft. In most cases this storage tank will provide cold water to upstairs bathrooms but in some properties all of the cold water taps may be fed from this tank.The condition of this tank may have an impact on water quality.deally you should only use a tap connected to the mains water supply for drinking, food preparation or teeth cleaning; however if your drinking water comes from a storage tank then it will be safe to use if the tank is properly designed, correctly installed and kept in good condition.