Hello all! My cya is around 160-180 with dilution testing method and I need to drain about 70-75% of my water. I want to do this drain in 3, 25% drain increments due to me having a vinyl liner. I don't have a submersible pump but I do have the multiport valve. What is the best way to drain 25%? Should I close off the deep end skimmer and the main drain or one of them? And what about the shallow skimmer? Is it possible to close the deep and shallow skimmer at the same time? I can then set the multiport to waste correct? I'm confused and am wondering what my best approach would be without the submersible pump. I have attached a picture of my skimmer and main drain lines.
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