Hi,
ADA has a product range called AquaSoil and another called PowerSand. You can substitute PowerSand (which works by providing a substrate for bacterial growth and nutrient sponging) cheaply by using plain pumice. AquaSoil's main use is to create an acidic substrate, so I think if you add a layer (1 inch) of peat beneath plain gravel (or mix it with base fert such as Dennerle/JBL), you will get the same effect.
Anyway, ADA has an European site here
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