Oh right, the shader pack needs to be put into the shaderpacks folder in %appdata%->roaming->.technic->modpacks->(modpack you use)-> shaderpacks (drag and drop the shaderpack) Same for non-modpack just w/o .technic and modpacks
All of them. The lines in your sky, in your ground reflections, etc. Those are graphical artifacts which are not supposed to occur. Check your graphics drivers, ensure they are up to date and compatible with the mod. If it's an integrated Intel graphics chipset, you can forget it - those are absolute crap for GLSL shaders.
Also check your settings in Optifine. Not all of Optifine's settings are compatible with the GLSL shaders mod, and can conflict, causing artifacts in rendering and even lower performance.
@Ar7ific1al I had initially accepted the lines as a general glitch for the shader pack, but then I saw pictures w/o it and I realized it wasn't supposed to be there. Googles it up, turns out it has something to do with the Anistropic Filter (I saw more that a few responses with this saying it worked, will try it in the morning)