I have a peace lily and when I water it, I put it in my bathtub and give it a good drink. I leave it there for awhile until I feel it's completely drained. But I'm losing my plant, as all my leaves are turning yellow and brown. If I pull them away, they come out of the dirt very easy and the roots are black. I know this plant has root rot. I'm hoping that I can save the plant. I'm hoping it's not too late for this poor plant. Please help me.