Ok so, my husband turned on the hose to top off my 5,000 gallon koi pond which was home to 3 very sweet and friendly koi.  He let the hose run for about 26 hours and completly flushed the system with tap water.  I am just now done crying after burying 2 of the koi last night...Pai Mei and Beatrix Kiddo...thats the names of the deceased.  I have one small 5" koi left and now that I know all this s…