Are there any cheaper options then maxigrow/bloom

I'm using a rdwc system and maxigrow/bloom work great I combine them with raw silica and have seen good results but I feel like there has to be cheaper options for commercial grows.
 
I've seen this and Jack's pop up on another forum from awhile back I'm researching both now. Looks like I still need a good cheap silica though
 
It has only a few ppm of silica. Most cannabis growers use 30-100 ppm.

Don't forget Jacks Oasis 16-4-17 for a cheap one part. It has a good amount of calcium/magnesium and the pH is rock solid from balanced nitrate sources.
 
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