I've inherited this above ground pool when we bought the house last january, so I've been working with it for 2 summers now. First summer was a learning experience, made much easier after discovering this forum (Thank you). This summer has been much much easier. Been using mostly regular chlorine/bleach from wallymart and occasionally those hockey puck sized chlorine tablets that I got last summer during the learning process. The pool chemistry seems 'good' to me based on the testing kit (forgot the name of it, but has all the normal tests (ph/alkalinity/calcium/chlorine/etc), blue box container with handle) anywho....
Seems since starting last summer and through this summer, the pool bottom (vinyl liner, 15x30 feet) has been developing these ridges all over. A small part of me thinks they might be roots of trees (pool is surrounded by them on 2 sides), but they're 'growing' too fast to be roots, plus the way some of the ridges intersect/end makes me think it can't be 'natural'.
In any case, i've attached some pictures of what I'm talking about. I'm not sure whether this is a chemical reaction to something, or if the sand bottom is moving around due to water pressure or what, anyone clue me in?
Since its getting to be closing time in my neck of the woods (omaha NE), i'm debating on whether I should drain completely and see what might be going on to try to fix. Not sure how often (if at all) the sand/bottom has to be 'reset'?