Facebook Pinterest Twitter Google+ Frequently Asked Questions iAVs sounds similar to the widely-used basic flood and drain aquaponics system (aka the Speraneo model)? What’s the connection? Is iAVs really Aquaponics? Where do I find the right sand? Do sand beds require cleaning? If so, how frequently? How do I convert my existing basic flood and drain system into an iAVs? If iAVs is so great, why isn’t it more widely known? Is iAVs really the most water-efficient food production system on the planet? Gary Donaldson was a strident campaigner for filtration in all aquaponics systems. Has he done a backflip? Can I attach gravel beds or DWC tanks to an iAVs?