a very typical 15k pool here (family but not mine) where I had added 2 days ago 4 bags @ 60 lbs salt and today, upon adding (what I hope) the final 2 bags (2 x 60 = 120 lbs) for a combined total 360 lbs, the pool cleaner hose experienced a "Bermuda Triangle" effect.
literally, about 5 minutes after the 2nd bag contents were dropped into the deep end, the entire length of the pool cleaner hose submerged, all the way to the bottom as in some old time submarine movie.
about 5 minutes later, the hose resurfaced only to sink down to the bottom again 5 minutes later (as I write this, the entire hose is laying on the pool bottom).
pump is running normal at 20 GPM but the surface tension is apparently gone awol. small ships nearby are also sinking (floating toys..)