Liquid silicon is added at the rate of 20-50 ppm to the nutient tank. Soluable Silicon that is used for algaes would be added at a similar rate. There is no real evidence that too much does any harm, but I would not go much above the 50 PPM.

Good luck,

Herbus
Herbus Reviewed by Herbus on . silica sands as silicate nutrients? My workplace uses significant amounts of silica sand, ranging from very small particle sizes (20 microns) to significantly larger (100-200 micron) and as such I can get access to a decent amount of it for free. Does anyone know if this would provide silicon for hydro plants sufficiently? Rating: 5