We call test strips 'guess strips' for a reason. You simply cannot run a pool based on info from them. Also, an OTO kit (what your 3-way kit is) is useful but doesn't replace the need for a better kit. There are some other testing numbers that we are going to need to be able to help you very well. Are you going to be able to order a Taylor K2006 mentioned in the posts above?

Don't drain the pool. With some good testing numbers, we can help you get it cleared up. For now until we do get some better testing info from you, aim to keep your chlorine at around 15ppm. In your pool (I estimate your volume to be around 5600 gallons), each cup of generic 8.25% bleach will add about 1ppm of chlorine. Each quart will add about 3.7ppm. You can use those as a reference to help you figure out how much bleach to add each time you test to take your chlorine back up to around 15ppm. Run your pump 24/7 while you are working to clear this up and backwash any time the pressure rises 8-10psi over your clean filter pressure or if you notice the flow is greatly diminished on your return jet.