hi , i see one of the shops in my area stocks it listd alongside triple f from hydrotops.
i guess it might be similar? some sort of biological activator or somesuch?
i tried triple f ,only coz i got a free sample .....quite a lot of mucking about and all it did was give my plants loads of horrid looking root mass which blocked up my nft and made a flood

.....cant say the plants looked healthier but it definitely had an effect even if it was a bad one.if i had more room or time or( like you ) the ability to do a comparison i'd give it another go .
fff comes with as a thick brown syrup and an activator (a little phial of dust?) .....brown stuff goes in the tank and the dust gets a load of air bubbled thru it in a solution at 20c and then in the tank...
....how does comcat work?
cf