I believe it is time release which I would never use or recommend. If you want fairly cheap soil your best bet would be to go to the hydro store and choose one from there. When it comes to soil Happy frog or Ocean forest is very good. There are plenty of good soils at a hydro store and all reasonably priced IMO. That Scotts soil you put up says it feeds for up to 4 months which isn't a good thing especially for indoor. Happy frog or Ocean forest will have enough Nutrients to last 2-3 weeks. When I used it I would let it go about a week then started feeding it lightly for about a week then went full after that. Do you have Nutrients you plan on using? Is there anyway you can go somewhere besides a major building supply store? If not I would try finding one that at least doesn't have time release nutrients in it.