The mod replaces TS2 water shader with modified Castaway shader (I had to modify it a bit so it actually works in TS2). However, considering the differences between those two games I sadly had to slave pond reflections and reflections on the sea water on non-beach lots to pool reflections. Ocean water on non-beach lots and in the hood view doesn’t need any special treatment. You put the mod into documents\EA Games\The Sims 2\Downloads (or documents\EA Games\The Sims™ 2 Ultimate Collection\Downloads). To make the reflections display properly on the pond you need to place two 1x1 pools so they create a rectangle, and the pond is inside that rectangle (it’s shown in the pictures on MTS), it’s normally the most convenient to put them in the opposite corners of the lot. For the sea water on non-beach lots just place a 1x1 pool somewhere on the lot (you don’t need an additional one if you already put the pools for the pond), the reflections will appear, but they aren’t perfect and how good they are depends on the camera movement and angle. Everything is explained in the thread on MTS; if something is unclear, feel free to ask though :)