Nothing has changed since we last posted about the slow extinction of hydroton. The inevitability grows by the day, as well as the gnashing of teeth.
Still, life moves on. In a year, most hydroponic growers will ask, “what hydroton?” Of course, the hydroton hoarders will blurt out, “what hydroton?”
Last week we discussed rock wool as a possible replacement for hydroton.
Here is another hydroponic media to ease the transition:
Stalite Expanded Slate
The Stalite Permatill company has at least one advantage over hydroton: close proximity. The North Carolina based business has both its horticultural and manufacturing division in North Carolina. Their slogan of “all rocks are not created equal” applies to both its structural engineering projects and a slew of agricultural applications. Their lightweight slate aggregate is produced by the rotary kiln process. 1200 degrees expands the rock, fractioning its former weight.
Stalite’s expanded slate products have 50% more surface area than typical gravel. It’s comparable to hydroton in numerous ways:
- It allows enhanced microbial activity and filtration.
- The slate is inert, sterile, and resistant to algae.
- It can be washed and reused.
- It is ph stable.
Stalite comes up short (when compared to hydroton) in drip feed hydroponics. In tests done at Fifth Season stores, the stalite did poorly in drip feed compared to hydroton.
It also sits well with the fishes. The Aquaponics community is a growing industry with both hobbyists and professionals looking for profit ventures. Since hydroton is phasing out, a lot of aquaponics enthusiasts are turning to expanded slate for its comparable attributes.