I fitted the whole unit and then it started leaking all over. Then I noticed all the problems. One of the hose connections on the side was torn at the bottom so it wasn't sealing. Water flowed into the block from where the plug enters the block. I do not know why. A significant amount of water flowed from the top of the block. I opened it up and found that the glass shell covering the UG lantern was cracked and broken, the seals weren't even there. The UV lamp itself has four pins and one of them was broken. I needed to get the pond working so I went to the local garden center and bought a new one to return. I put a new one on, plugged it in and it's working again. They found that the glass had broken again and water was leaking from under the cork. I have no idea why this is happening. On the plus side, the pump worked great. It was all a filter. There were other Laguna products that I liked. Replaced my original unit because it had an accident with a new pup and stopped working. Driven for 6 years with no problems. I'm not sure why they aren't that good.
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