I have a dark blue liner. It looks 100 times cooler than my neighbor with the real light blue liner. Plus, it's supposed to help keep the water warm.

Also, I have a SWG. My pool store said "You still need to shock it." They don't make near the money off of SWG owners. I'm a dummy at this sort of stuff - I spend my days giving financial and tax advice - but I think I've figured out the SWG after about a month. 2-3 minutes a day taking care of it has worked so far.