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![](./images/dot_clear.gif) |
![](./images/3.methodology/slow_sand_filter/a.bucket_small.jpg) Start with a plastic tub |
![](./images/3.methodology/slow_sand_filter/b.batting_small.jpg) Add polyester batting |
![](./images/3.methodology/slow_sand_filter/c.gravel1_small.jpg) Coarse gravel layer |
![](./images/3.methodology/slow_sand_filter/d.gravel_small.jpg) Fine gravel layer |
![](./images/3.methodology/slow_sand_filter/e.sand_small.jpg) EWEB filter sand |
![](./images/3.methodology/slow_sand_filter/f.gravel4_small.jpg) finish with river rock |
Filter Construction Procedures
Ingredients
5 gallon plastic tub (with drainage holes drilled in bottom)
is filled with the following layers of materials:
- 1"- 100% polyester fiber
- 2"- 3/8" round rock
- 3"- 3/4" round rock
- 3"- filter sand (uniform grain size about 0.5mm)
- 1"- 1 1/2" round rock
Preparation
- Flush system using Millrace water until effluent clarity is indistinguishable
from incoming water. This process (about 2 hours) helps to encourage the
development of a "schmutzdecke" (a layer of biological slime that aids in
trapping small particles.)
- Filter is elevated and slightly tilted to encourage water flow and catchment.
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