Quick Answer
Cost-effective methods for filtering collected rainwater include using a combination of coarse mesh screens, sand, and charcoal, which can be purchased for less than $100. These materials can effectively remove debris and contaminants from the water. Additionally, DIY methods such as using a brick filter or a simple sand filter can also be effective.
Pre-Treatment and Coarse Filtration
Pre-treating collected rainwater with a coarse mesh screen or a small mesh bag can remove large debris and contaminants. Use a 1/4 inch mesh screen or smaller to keep out leaves and other loose material. This can be purchased or made from a simple wire mesh material.
Fine Filtration and Activated Charcoal
Using a combination of fine sand and activated charcoal can provide a more thorough filtration system. Mix 2-3 inches of sand with 1-2 inches of activated charcoal in a container with a 1/8 inch mesh screen. This can effectively remove bacteria, viruses, and other contaminants. Activated charcoal can be purchased for around $20-$50 per 50-pound bag.
DIY Filter Options
A brick filter can be a simple and cost-effective option for filtering rainwater. Build a filter using a brick or stone, with layers of sand and gravel, followed by a layer of activated charcoal. Another option is a simple sand filter, which can be built using a 5-gallon bucket, sand, and a 1/8 inch mesh screen. These DIY options can be built for under $50 and can provide effective filtration for small-scale water collection systems.
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