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Some kind of prefilter is good Reece has one he has used I believe some kind of fuel filter material. The cloth trick is a good one, slow but in desperate situations would work. I have used a ziplock bag in the past for really shallow pools, kind of like your cut off platy.As to springs the only one you listed that might not make the solid list is Hermoso. It has been a long time since I was by it but I think it was not flowing then. I hope to walk by it this winter and see. Others may have better info.
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