I will add a handful of DE in the AM. The pressure is not rising at all and when I backwash, the water is only a little dirty not like I have seen it earlier this summer. The pump basket also has bubbles in it and I can hear water sloshing in the filter which I do not remember hearing before. I was just thinking "maybe the filter is not working properly" when I read your post. The filter is not even a year old. Wonder if there is a problem in the pump? It is loud and old. The water is so cloudy with dead algae that the backwash should be filthy and it was not this evening.