Algae scraper blades

[Simon Cole]

Hello everyone,

Do I want curved or straight razor blades on an algae scraper rod?

In the past I have scored glass with razor blades, so I thought it best to check now.
Thank you.

 

[Miniandy]

I have had similar and it's the corners that can cause issues. The blades on my budget one from amazon have rounded corners but are straight along the edge. Not sure if that helps.

https://amzn.eu/d/9EG2sDc