I have a pond that is 900 gallons and has a rubber liner. I have cattails, lizard tail, yellow flag, pickerel weed, about two types of water lilies, a lotus, and arrow arum in the pond. All are in pots. Recently I have realized that the water in my pump/skimmer area drops to about 50% of recommended volume and I hear the pump sucking in air. I am wondering if I may have a leak. Is it recommended to remove the water plants over the winter? I question whether after 4 years of leaving my potted plants in the pond may have allowed the roots to penetrate the liner as the roots have burst through some of the plastic pots. Any insight is appreciated.