They say that ph will swing in 5.7-6.5 range. The also say "The perfectpH is recommended for Deep Water Culture (DWC), Nutrient Film Technique (NFT), Flood and Drain, Aquaponics, or any combinations of these techniques". This is weird because they later say that it is not recommend for aquaponics. They do not recommend for drip systems like the Wilma. Not sure what the autopots are considered. They also say that it doesn't work with unstablized silica and some nutes. Read the FAQ.