I have my own test kits they are less than a year old! I built a DIY filter chamber today to hold two 10 oz units of chemi-pure or anything else I want to use. It will be fed using a maxijet 1200 utility pump. The water will be pumped out from the first chamber (from the overflow box) into the bottom of my DIY filter the water will be pushed through the filter bags then exit through the top then discharge to the main chamber or return pump chamber!!!