One of the filters has developed a slow leak in the output pipe. We were working on that until 2 months ago. A back injury here has stopped our work. We will be healed up probably within a month from now. The rest of the filters are still functional. Covid is still with us here. Its been nearly 2 years now. We will not be able to have professional testing done yet.
We are still in the process of getting more data from our websites into this blog. The fish pond is doing well and the slow sand filter is keeping the water crystal clear. When we are able to get around better, we will try to get a video up showing the filter and the fish.