03-30-2009, 11:58 AM
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Originally Posted by SantaMonica
Update: Screen roughness
If your screen is only growing little spots of algae here and there, it means the screen is not rough enough. What is happening is that algae is trying to attach and grow all over the screen, but the water washes the algae away. Only a few areas have enough roughness for the algae to hang on in the water flow. So, you need to remove the screen and really really really sand/scrape/rough it up. If it's a clear screen (i.e., acrylic), you should not be able to see through it. If it's a plastic canvas screen, it should feel prickly. For highest results (and highest maintenance)... rug canvas works the best, but it only lasts so long before it comes apart. Then you have to make a new one. Whatever you use, make it as rough as possible.
Thanks, this explains the spotted growth on my screen. I used cross-stitch backing from the craft store. So after reading this I fabbed up a new screen from a sheet of acrylic, I'll update when growth starts on this screen. I need to finish drilling it and find a way to mount it, should be running later tonight.