As mentioned above, the tablets could be useful, and the shockwave and the burnout 73 appears to just be calcium hypochlorite (check the ingredients)- You could use it, so long as your calcium hardness isn't too high. Before I got a SWG, I would keep it around during the rainy season when my calcium hardness would get to the low side of normal.
The silk guard and smart shock have copper- definitely get rid of those.