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Hydrotons, or Clay Pebbles, or LECA (Light Expanded Clay Pebbles) are an excellent growing medium in Hydroponics, Aquaponics, and Soil-less Gardening.They are much lighter than clay pebbles and suitable for growing microgreens and in systems where weight is a constraint (like DWC). However, unlike clay pebbles, Fly Ash pebbles do leave residue behind and thus if you are planning to use them in a recirculating system like NFT or dutch buckets, do use a filter to avoid clogging the pump. They are an excellent medium to be mixed with soil or cocopeat for improving the water holding capacity and aeration in the growing media.