Wanted to perhaps pick the brains of those who have more knowledge than myself... I have a 2 bag Sandfilter set-up that runs through a 30watt Zap UV Clarifier and into a biofilter and then back into my pond... system works great but I am constantly battling with the UV Clarifier... either the globe blows or the actual unit goes weird on me and stops working... I now have 2 Zap 30 watt units that I interchange constantly but still no luck with keeping them running properly. The other hassle I have is that whoever set they system up squashed it into a really weird space so it's all very tightly packed which might be a problem as well. Couple of questions: Is there a tougher UV unit I can get hold of that will last longer, or should I be lookng at one of those "inclusive" biofilter/UV combos to prevent this Zap Unit from dying on me all the time? If I do get a biofilter UV/combo, can I still use it in conjunction with the sand filter?