If this scraper There is a new blade, I can easily clean 3 sides of a 21 x 21 x 72 inch marine aquarium. The blade is basically a razor blade with a rounded corner to avoid cutting into the corner of the silicone. After every thorough cleaning I have to change the blade. The blade lasts longer but requires more force to clean as the blade becomes dull. I've had multiple uses on each side of the reversible blade, but as mentioned, the power increases with each cleaning. The only two suggestions I have are that the handle should be reinforced a little more. It tends to bulge when used on stubborn algae/dandruff. If the handle were twice as thick, it would hold up better to aggressive use. The scraper head is designed to reduce spatter during use compared to other scrapers I've used. The only other area of improvement may be the availability of spare blades. I couldn't find a replacement blade for the scraper handle and I suspect that when the blades that came with the kit go missing I'll have to order a brand new scraper. Hope that helps. By the way, I used this scraper for several months prior to this review.
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