Cloudy Water

[BigDave]

Power Powder is Calcium Hypochlorite and will add to your calcium hardness. Aylad suspects that calcium is part of your trouble so it's probably best to use Sodium Hypochlorite (aka bleach, liquid chlorine) to chlorinate the pool. Since you've experienced FC of 0 lately your cloud may also be an algae bloom starting.

Do you know your CYA level? You're going to need a good testkit, we recommend the Taylor K-2006 (accept no substitutes!). It can only be found online - if you order through the Amazon links on the How to Get the Right Testkits for your Pool the Pool Forum will get a few scheckels for sending you there. While waiting for your K-2006 (you have ordered it, right?), you can see if your local wall mart carries the HTH 6-way drops kit (check availability). If they do, pick one up, it is compatible with the Taylor K-2006 and will let you measure CYA.