Grinding stones are the workhorse consumable for an EDCO floor grinder, and super coarse is the grade you fit when the slab has something on it that has to come off. Trowel marks, rain spots, splatter and excess concrete, rough finishes, high spots under a sixteenth of an inch: this is the stone that takes them down. It ships as a 12-piece pack, which is how these machines are loaded, so you are not piecing together a set from singles.
Built for
- Concrete contractors knocking down trowel marks and high spots on a fresh pour.
- Surface prep crews opening a slab before staining, coating, or sealing.
- Garage and basement floor projects leveling ridges before an epoxy goes down.
- Rental yards and shops keeping EDCO Classic grinders stocked with consumables.
- Restoration work smoothing rain-spotted or weather-damaged surfaces.
What to expect for removal rate
An EDCO grinder fitted with C-10-S super coarse stones removes up to about a sixteenth of an inch of concrete at a rate of roughly 500 square feet per hour. That number moves with conditions, and it is worth knowing which ones. Surface hardness, aggregate size, the age of the slab, and any additives or sealers that had to be met for the surface specification all change grinding speed and removal rate. Adding weight to the grinder increases downforce and improves grinding speed, which is the standard adjustment when the stones are riding rather than cutting.
Contractors who have run both stones and diamond segments describe the trade-off plainly. Stones are inexpensive per piece and perfectly capable, but they are slower: reports of spending the better part of a working day grinding a two-car garage with stones are common, where diamond tooling would cut that dramatically. The honest read is that stones make sense for occasional work, for softer or greener concrete, for rental fleets where consumable cost matters, and for jobs where a decent finish rather than a slick polish is the goal. If you are grinding production square footage every week, diamond segments pay for themselves in labor.
Construction
These stones use high-grade aluminum oxide abrasive in a resilient bond matrix, which is what lets them hold their shape through the cut instead of rounding off early. C-10-S is the super coarse grade in the EDCO stone lineup, sitting below coarse, medium, fine, and super fine grades used for progressively finer passes.
Specifications
- Manufacturer: EDCO
- Part number: 11074-12
- Grade: super coarse, C-10-S
- Pack quantity: 12 per pack
- Abrasive: high-grade aluminum oxide in a resilient bond matrix
- Application: EDCO low RPM floor grinders
- Removal: up to approximately 1/16 in. of concrete
- Rate: approximately 500 sq ft per hour under typical conditions
Frequently asked questions
What is a super coarse grinding stone used for?
Removing trowel marks, rain spots, excess concrete, rough finishes, and high spots less than about a sixteenth of an inch in height.
How many stones come in this pack?
12 per pack, which is how EDCO low RPM floor grinders are typically loaded.
How fast will it grind?
Roughly 500 square feet per hour with up to about a sixteenth of an inch of removal. Surface hardness, aggregate size, slab age, and any sealers or additives all affect the actual rate.
How can I speed up grinding?
Adding weight to the grinder increases downforce and improves grinding speed. This is the standard adjustment when stones are riding on the surface instead of cutting.
Should I use stones or diamond segments?
Stones cost less per piece and suit occasional work, softer concrete, and rental fleets. Diamond segments such as Dyma-Serts cut several times faster and make more sense for regular production square footage.
Discount Cleaning Products is an authorized dealer for the brands we carry, and our US-based team works with these lines every day. If you are not sure which option matches your equipment or your job, contact us before you order and we will help you get the right one the first time.
