Where to buy - Depuradora reactivation kit

[TamaraEnLaPlaya]

A few weeks ago I saw a kit for sale that can be used to reactivate a depuradora that hasn't been used for a while or in partial doses to clean waste pipes leading to it. It wasn't cheap - just under 50€ - and I didn't have enough cash on me at the time to get one but on reflection I'd like to have one to give my pipes a freshen up without using harsh chemicals which will kill the natural process in the tanks and get through to my plants. It was on a hanging display in a plastic bag but I can't remember where I saw it. Help please!