So I was going to walk through the ENTIRE process we had to take to get the tub clean, but that would be long and boring. So here is the short of it.
1. Fill the tub with water. Discover that there is A LOT of rust in our water. Add enzyme to clean out the lines. Run tub for 1 hour and let sit overnight.
2. Drain tub. Wash down the sides and bottom of the tub. Refill and overfill tub with water. Use an improvised filter (ie old coffee filters attached to hose with zip ties). Add a large amount of Clorox to kill any lingering nasties. Run tub for an hour.
3. Drain tub again. Refill tub with aforementioned improvised filter. I am REALLY not looking forward to seeing our water bill. Balance alkalinity, pH, and hardness. Add starter bromine (if you are going that way) and shock with Chlorine.
4. Let tub get to temperature, make sure everything is at the right levels, Enjoy!!
Valuable lessons we learned -
1. If you ask a pool supply place about a hose filter or Chlorine neutralizer, they will look at you like you are an alien (at least in this area). You are better off finding it online. Same with a new filter. Although they had at least knew what we needed, they just didn't have it in stock.
2. When you need to add 2 oz or 4 Tablespoons of Clorox per 100 gallons of water, don't multiply 4 Tablespoons for 16 Tablespoons, then translate that into 16 oz. That's twice as much Clorox as you need to add and it means there is more work to be done.
3. The best way to bring down a tub with WAY too much residual chlorine is to just remove some water and add fresh. OR if it's almost at an acceptable level, have you husband sit in the tub after a run.
4. We should have gotten this thing working a year ago.