I'll let someone else answer your questions about your drains and skimmers. But, in regards to your chemistry questions, repost about that part in the chemistry section of the forum instead of here in the equipment section. When you do, include a complete set of current water testing results taken with a drops-based kit and then somebody will be better able to advise you. Include the volume of your pool in your post. Also, use the google search in my signature below to look for other threads where people have discussed how to manage their pools while on vacation.
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