Welcome to TFP!
No Mor Problems is sodium bromide which, despite what it says on the label, is not an algaecide. It creates bromine when it reacts with chlorine, but if added to a pool with little to no chlorine it will do absolutely nothing to algae. Regular use will build it up in your pool and convert it from a chlorine pool to a bromine pool, which is not good for an outdoor pool. In other words, and forgive me for this joke, using No Mor Problems can end up causing you some major problems...
In addition to Yippee's question, how long have you been using this as an algaecide and how are you chlorinating your pool? This will help us get an idea what is going on.