Last year was the first year I owned my pool and I closed it myself using this site and some information from the previous homeowner.
This past weekend I semi-opened the pool. I did everything except for getting the water circulating because I am having a new sand filter put in later this week. One thing that I did when I closed the pool was removed the light fixtures niches from the holes in the pool and sunk them with weights (this is what the previous owner did). I have not screwed them back into place yet so I am wondering if I can leave them off so that when I slam the pool (it is dirty and slightly green) once the sand filter is running the back of lights and their niches and the holes in the pool wall will also get the slam process?
Or should I just screw them back on? Also- do I really need to sink these to the bottom each year when I close?