Well, looks like you figured it out. Well done. If auto manufacturers routinely have recalls due to a bad part, so can a sprinkler heads.
On a side note, that algae buildup in your filter appears to be from the sun causing the bloom, even if it is for a short period shining on it. It should be easy to solve to see if it really needs changing. Don't use a clear cup or you could place something over or wrap around the filter to block the sunlight.
Algae bloom can occur in just a few days in direct sunlight along the edges/sides of the container, even though you think the movement of water would stops it. On a micro-scale the bloom starts, as it gets thicker the bloom continues to grows it's thickness. Just one less thing blocking up your filter.
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