Compatible with any spray bottle. Just open the package, drop the tablet in hot water, wait 5 minutes for it to dissolve, shake for 30 seconds. Recyclable and compostable. Can be used to eliminate soap scum and grime from shower doors, toilet bowls, tiles and vinyl curtains. One tablet is equal to 700ml of liquid glass cleaner. Biodegradable and come in zero-waste/eco-friendly packaging.