just wanted advise on my Koi pond, have had it for over 10 years, and now wear may be taking over on the foundation... something I dreaded... I currently have 10 Koi ( med size) use to have 15 but lost the oldest due to water contamination,sad day... Non-the-less I have a question, any ideas on why I may be losing water too fast? Its got a home-made filtetration system, and works pretty well over the years, In January I installed a UV-light filter to manage the algae- great addition. The water normally requires a 8-10 gallon "refill" 30-40 days due to evaporation. But, 2 weeks ago I started having to refill with 30 gallons by end of each week. Thats insane. I worry if I have a leak now..