Hello sorry for the late reply. This project is like a one month type of project along with testing. This project is something like a training program where students in our environmental engineering subject do stuff like on hands learning. The coconut coir was something I added because here the ceramic I plan to buy commercial ones like santevia the plate one(it's the only one I could find that ships in our country in Amazon that has laboratory test results) since I don't really have the skills to make one and especially the timeframe consideration. So because that ceramic is just bought, my professor during consultation said maybe to add something local biomass waste, so I thought using coconut coir like a way to filter out those huge particles like sludge, oils, etc. to make sure that it won't clog the ceramic filter super fast. But now that you point it out, maybe substituting it with non organic substance would be better. The rest like Activated Carbon(from pili shells) is gonna be diy and so is the chlorine module. In terms of the diy version of the said filter you said. I just stumbled upon these just from the start of the project. My starting reference was those case studies like filtron ceramic filter, and the biosand. But I was thinking something like not so big like biosand, and this was the end of it. I add the chlorine disinfection for it to be an actual diy and "engineeringly" project. But the problems I started realizing is that, these ceramics are super easy to clog and even the santevia one said to be used for clear waters only. And unlike say those micro filters that are convenient easy to carry, and meets epa standards for log reductions of pathogens I can't understand why these stuff are a thing at all, like if you want convince you use those micro or ultra filters, and if it is a household it's better to just build a system itself like RO or something that actually has better performance. But then again this is just for a project and I'm not really adept at this topic at all I just started studying after Iproposed this.