I started using Nualgi last year. I like it. However, it's not a miracle cure. The pond still has to go through the balancing act. In my pond, that takes about a month in the spring. I do dose regularly at the beginning per the directions. Once it balances and is clear, I don't do it every week, but wouldn't see anything wrong with doing that. I like that it is such a small amount compared to previous products I have used. It's not cheap to buy a bottle, but I have a 4,000 gallon pond and I have had this bottle for 2 summers now. Getting down to the bottom of the bottle, but it only takes 1 tsp to dose my 4,000 gallon pond.