Some kind of light is hitting it. You wouldn't have algae if light was not getting to it. I would cover it with a cloth and rubberband to hold it over the canister.
Yeah I would change it asap that will kill the life of your membrane. So consider finding a place inside for the unit. If there's no place for it inside consider making a cover for it so no light hits the unit at all.
As stated change the filters asap and keep light away from it. I knew someone that had a unit in direct sunlight and built a box for it to avoid this kind of issue.
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