I hate to say it, but that looks a lot like dead algae. There's no harm in keeping your CYA at 30. You'll just have to run your SWG a little longer each day to keep up with the FC loss due to sunlight. That shortens the lifespan of the cel, but I end up having to replace mine every other year anyway. They are $68 plus shipping from Intex.
Do you have a cover for the pool? If so, it might be worth the effort to keep it covered while not in use to keep the tree pollen and grass out of it. At least until you can upgrade to a sand filter and a bigger pump. That will go a long way towards keeping this gunk out of your pool.
Since you've passed the SLAM, I don't know that you need to start it up again, unless your overnight FC loss gets back over 1.0 again. But if I were you, I'd definitely keep my FC toward the high end of the recommended range for a while.
Do you have a cover for the pool? If so, it might be worth the effort to keep it covered while not in use to keep the tree pollen and grass out of it. At least until you can upgrade to a sand filter and a bigger pump. That will go a long way towards keeping this gunk out of your pool.
Since you've passed the SLAM, I don't know that you need to start it up again, unless your overnight FC loss gets back over 1.0 again. But if I were you, I'd definitely keep my FC toward the high end of the recommended range for a while.