I forwarded this to Anna an Juan since they were the ones working on the pH control

Thanks!
Well, we just used google slides to put it together because we all worked on it remotely. If you want to draw great illustrations, I highly recommend you to use a vector graphics software. Inkskape for example is great! It is open source and free and has so many great plugins.

Thanks for sharing your thoughts! We are still working on improving the aeration system and will take the aluminium filters in consideration!