Came into this post rather late. I removed the UV light from my submersible filter and replaced it with a cap....one reason was not to have a 2nd electrical cord running out of the pond, but more so because the UV light, from what I have read here, is just a temporary fix if you don't remove the cause of the problem. Am I correct or incorrect in thinking this?
Always best to address the cause. However, reality is tough to ignore and removing the "cause" often have ripple effects. Limiting nutrients are either phosphorous or nitrogen. Reduction of these nutrients will lead to fewer problems with algae, but this will also impact fish's natural food sources as well as reducing the "ecosystem", which means a possibility of using more fish food. Fish food also releases more phosphorous and nitrogen. I suggest the best route is to increase the pond's flora diversity and density and be frugal with using fish food, but I understand this is not always a possibility. So, best you can do is control the excesses, which this may involve using a product or techniques to precipitate phosphorous or a device to reduce nitrogen or possibly even usage of additional filtration including UV.
Be aware, more intervention involved, the more maintenance involved.
If you want to conserve time and money, then I suggest a payment of time to have patience, as well as tolerating the hopefully temporary symptoms this may create. Increase flora density and diversity. Maintain a lower fish density and allow Nature to feed the fish. If this is not possible with the pond, then the pond construction it self may not be conducive to warrant less intervention.