Not sure why it has now vanished but it may have just been some impurities in my initial water fill or the initial load of dust/dirt/debris that was in the pool when it was first filled. In the last two months I have not noticed this grey line to appear any more. along the water line outside of the skimmer box. I did not see any trace of this anywhere else in the pool ie. Mine was also greasy but would relatively easily wipe off with a sponge. This may point to it being some contaminant on the surface of the water rather than in the water.? Grey line was only on the internal skimmer wall housing and only towards the rear 2/3d's of the skimmer wall not towards the front of the skimmer and nothing around the entrance to the skimmer or the weir door itself. It was always only evident where the water had flowed in past the skimmer weir and was hitting up against the skimmer internal wall. In the first few months of operation and balancing my water I noticed a similar scenario where a broad grey line would appear inside the skimmer box at the water line. I have a brand new fibreglass pool - Installed late April but no one has swum in it as yet - Currently winter down here in Australia so water temp is hovering around 10 Celcius! I'm hoping that the two aren't related in any way, but wondering if anyone might have had a similar experience I don't know anything about that equipement, but I posted about the filer leaking water in a separate thread ( Sand filter trickle leaking - should I be concerned?). What I am MOST concerned about is that there is something mechanical in the equipment - either pump, or filter, that could be leaking. The first time I saw it I thought it might just be sunscreen residue, but when I saw it again a few days later with nobody having been in the pool, I started wondering if it might be something else - perhaps there is some kind of pollution in the air that is making it into the water? I even wondered if caterpillar droppings (seen some recently) or other biological waste (bugs - apparently they love dying in the pool) might cause it. In any case, it's truly "greasy" and when I rub it off with paper towel it smears. It doesn't appear to be showing up on the water line elsewhere around the pool, though it's harder to tell because the pool walls aren't white. I recently started noticing a dark grey sludge/grime on the water line in the skimmer.
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