Those who want the best for their Koi sooner or later come to the conclusion that you cannot ignore hardware and pond technology. The filter, the pumps, the pipework and other things such as a feeder, your landing net and koisok belong to this category. A microscope is also a highly recommended tool such as smart meters for your water values. In this category you can read everything about the 'gray' sector of the hobby. We also test various pond-related products in a special subcategory.