Good morning, Kayla, we should be able to help. We are a small NGO specializing in water treatment using locally available materials (to date, primarily in Uganda). www.wedevwater.com We don’t sell any products. We provide the knowledge for you to work with what you have.
We have a design for slow sand filters from a garbage can. You’d have to sift the sand to the right particle size and you’d need a bit of piping. Also, slow sand filtration takes about 20 days to build up a schlamm (mud) layer before it begins to effectively remove bacteria. They are effective, but keep in mind, a slow sand filter in a garbage can only produces enough drinking water for a family of five in about 24 hours (There’s a reason it’s called a slow sand filter). You can build them larger, but that gives you a feeling for how much it produces. It lasts a long time.
Elliot is correct. The main drawback for the clay pot filters is that the silver layer wears off. I haven’t used Aqua Pure’s version, but it sounds like it’s addressed that issue.
SODIS is also effective and one that you can start almost immediately. The important thing to remember here is achieving low turbidity (could use a rapid sand filter) and you need to be sure to mark the bottles. Typically, you’d do a day on/day off method, leaving one set of bottles for each day, treating it, using it and refilling, while the other set of bottles is being prepped for the next day. It’s just very important not to mix the bottles. Rain water is a good candidate here. Any residual bacteria from the roof runoff (bird poop and the like) would be killed by SODIS.
We have another design for a rapid sand filter in a barrel. We’d typically use a water storage tank for a community of about 100 persons, but you can adapt it to your needs. It reduces the turbidity to under 10 NTUs. In our research, 10 NTUs is enough.
Lastly, in regards to Elliot’s comment on chlorine, we’ve developed a simplified salt chlorinator in a water bucket (a simplified version of the one developed by GE). Simply a car battery, titanium electrodes and salt (works better with solar, if you have access to that. The energy consumption is very small). Biggest drawback here is access to titanium electrodes. But once you have them, it’s very effective. A 10 liter bucket produces enough in 20 minutes for about 100 persons. It does require supervision and some understanding of the process (It’s easy, but very important)!
I’d be happy to consult with you, if you have access to any conferencing platforms (Teams, Skype, Zoom, etc.) It’s just faster to find the best fit for you than posting. (We’re free, by the way).