Water Filter for Cambodia

3D Printed Exterior Shell (Step 2)

Some form of activated carbon

Charcoal is likely the most common and most easily attainable

Fabric

Cloth, Coffee filters, Makeup pads, etc.

Use Prusa MINI printer to print out the exterior shell

The material of the product should be PLA

The exterior shell will consists 2 parts as shown in photos: main filter exterior, filter cap. The main filter exterior has holes in order for water to go through

File for the exterior shell & print setting: https://drive.google.com/drive/folders/1...

Setting for PRUSA Slicer: 25% hexagonal infill, recommend walls, with organic supports

In some cases, the 3D printed parts might have issues with water leaking out of the filter

We mix the resin solution according to the instructions on the XTC-3D package

The resin should take 48 hours to dry in normal room temperature. In the case where the resin does not dry, try using alcohol/ acetone to wipe out the excess

If the excess could not be removed, discard the 3D printed part. Do not continue to try filtering water using that 3D printed part. It is hazardous to consume resin

Wear gloves and face mask during this process

Take coffee paper filter and place at the bottom of the filter. Make 4 layers

Then add 2 pieces of cotton pads on top

Then add a reasonable amount of activated carbon depends on the size of the water filter.

Wash the activated carbon before conduct this step. You can simply rinse it over water a few times

Repeat this process following the diagram until the filter is filled up to just bellow it's threads

Close off the filter and voila you can start using it to filter out water

Use the Water Tester to test the water. Read the results based on the picture provided

Use separate cups for different samples. Do not mix to create inconsistent results

Consider using other types of water test kit: bacteria test kits, pH levels test kits

The water tester cannot let us know if there are bacterias like E.coli so it is important to use other test kits if you are working with health hazardous water samples

1. Water Test Kit with 16 parameters of major contaminants: total hardness, free chlorine, total chlorine, bromine, total alkalinity, pH, nitrate, nitrite, copper, iron, lead, nickel, carbonate, MPS, cyanuric acid, sulfite

2. Bacteria Test Kit: Let the bacteria test kit dissolve in the filtered water for 48 hours. This kit will inform us if the water is contaminated with dangerous bacterias. Green - Safe, Yellow - Dangerous

Most modern home filters make use of a combination of methods to create as clean water as possible. The four that are almost always used are,

Sedimentation (Mechanical Filtration)

Mechanical filtration physically blocks unwanted particulate matter from infiltrating your water supply. This is done with pressure from the water line, which forces water through fiber wraps of the medium into the inner cylinder. Fresh Water Systems. University of Nebraska Lincoln

Carbon

Carbon filters remove contaminants through adsorption. Contaminants are attracted to the surface of the activated carbon and held to it, thus removing them from the water. ESP water

Reverse Osmosis

Awater treatment process that removes contaminants from water by using pressure to force water molecules through a semipermeable membrane. ESP water

Chemical

Thank you so much for looking into our project. We certainly had a lot of fun and we hope you do too. Thank you for checking out a project for the social good!