I unfortunately do not have a diary with my work with STG. The work I was doing came to an abrupt end before I could harvest, and create a proper diary. From the work I was doing, despite a nutrient line I was not such a fan of, I was getting very nice results. If I can find some pics of the work I was doing I will gladly post them here.
STG is actually recycled plastic that is extruded into fibers and then formed into cubes, mats, slabs, pellets and loose fill. I have used all of the products except for the mats. The hail (pellets) is what you saw for 50% off on their website, Suretogrow.com. I was privileged enough to do some of the testing for the hail, and I really liked it. I am normally a soil farmer, but in trying to expand my knowledge of growing styles I worked in a hydro setup with the STG.
I used the hail to keep moms and fed them by hand. Once the moms really took to the medium, I was watering them twice a day. I was at that point going to switch them over to a perpetual drip system as they were starting to demand that much nutrient solution. I was using an aero cloner and tried their plugs but did not like them all too much, since they were white and not very big they allowed too much light in. I used the regular plugs for the cloner and transplanted the new plants into 4" STG cubes and back filled with the hail. Then I would place ten cubes into a 4' trough, and the trough into a tray under T-5's. I could fit three troughs into a tray. The cubes then got a constant drip feed for 24 hours a day and 18 hours of light. This is where I really saw the best results. The STG allowed so much air to flow through, if the drip feed went off for even an hour the cubes would begin to dry. This helped with some really explosive root growth.
Those plants were vegged for 10 days and when ready for flowering, 6 were placed onto a 6" thick slab at 1 meter long. The slabs were then put into 4X8 trays under 2 1000 watt HPS lamps in air cooled hoods. Originally I had tried to use a drip system to feed the plants but was not having very good success, although I do feel with a bit more tweeking, I could have improved the results with the drip feed. But I eventually changed the flowering trays to an ebb and flow. I was able to get the formula down for the ebb and flow, how many waterings per day, where my PPM should be, pH balanced, all the things that make any hydro grow successful. Right as I got everything dialed in the project came to an end.
I would absolutely give STG another trial, and this is why I recommend it to anyone. Something very important to remember with STG is to use totally soluble nutrients because if there are any particles in the solution they will build up in the medium.
I know I did not give a lot of product specs, but if you need them check the STG website.