Whether your home relies on rainwater harvesting, bore water, spring water or another private water supply, installing a UV whole house filtration system is one of the best investments you can make for your family's health.

El Niño can significantly influence New Zealand's weather—particularly during spring and summer. For lifestyle block owners, farmers, horticultural businesses and homeowners relying on stored water, now is the ideal time to prepare.

Not all water that is stored in water tanks comes from a pristine source, in fact, many undesirable contaminants often exist right at the point of collection, and the most common issue is contamination of roof water from completely normal environmental factors.

Too little storage can leave you relying on an alternative water supply during a prolonged dry period. Too much storage can mean spending more money and using more space than necessary.

So, how much water storage do you actually need?