Another thing, irrelevant of how rough the material is initially, once the algae gets a foothold, it stays well attached. So the only difference here is how quickly it gets attached. I've had several customers have screen go from bare to full green in 5-7 days and others take months. Every system is different and this translates to differences in scrubber initial growth. So you can't throw one good one up as an example for everyone to have expectations for theirs unless you have another one in the same system to compare to.
Not necessarily.. we still dont fully understand why some screens take off and others dont.
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