Nov 16, 2009, 7:02 AM
Post #5 of 18
Not saying your nitrates are not acceptable. Just saying if you want to solve algae issues, simply slapping a UV onto your setup doesn't really solve it. The UV does kill off the free-floating algae, but as long as conditions are good for algae, carpet or string algae will simply take over. That's my personal experience. Algae needs food (nitrates/potassium), CO2 and sunlight for growth. So if you control/deprive either one of the factors, you control algae growth.
Since UV is your choice of weapon, you can consider installing a submerged UV. I got mine from Max Koi Farm and I think 18watt is the lowest which should cover you for ponds up to 10 tons. However, you MUST consult the professionals for proper advice. Obviously the higher the wattage, the quicker the results but I guess installation and running costs should be considered. Alternatively there are overhead UV setups, but my personal experience with them isn't good.
Btw, you can also look at biological algae control. I've used a product called Interpet Blanket Weed Buster back when I had a string algae bloom (with my UV light running ). I was quite amazed by the effects. I combined it with physical removal of the string algae (scrubbing), but I noticed that the carpet algae was actually dying off after I used the product. It claims to use bacteria action to combat all forms of algae and so is safe for koi. In fact, I noticed after using it my koi had better appetite. Psychological? Maybe.
Another method I've heard of is using ultrasonic waves to disrupt algae activity. But personally, I don't like the idea because I don't really think its good for our koi.
Best of luck in clearing your green water,