Bio-Sand Water Filter Plans PDF | DIY Off-Grid Water Purifier | Bucket Filter Build

The bio-sand filter is the classic slow-sand design used worldwide: a 5-gallon bucket, washed gravel and sand layered to the right depths, and a bio-layer that matures over time to treat water. Build one for your homestead, cabin, or emergency kit.

Inside this 10-page full-color PDF: a complete materials list and cut list, 4 illustrated step-by-step build steps (prepping the bucket, washing and layering gravel and sand, fitting the spigot outlet and diffuser plate, and commissioning the filter with first flushes and bio-layer maturation), pro tips, safety warnings, a troubleshooting section, and a final build checklist.

Skill level: beginner. Typical working time: 3–4 hours. Crew: 1 person.

This is a DIGITAL DOWNLOAD — no physical item will be shipped. You'll receive a full-color PDF instantly after purchase. For personal use only; not for resale or redistribution.