I have used a gallon and a half of the liquid and it's still not up to 70. From the calculations it should be. What could cause this?
Absolutely! Just refer to the Chlorine/CYA Chart (link below). As long as you don't exceed the FC SLAM level for your current CYA, let them swim. Give them some brushes too. Make it a scrub party.If I start the slam again is it safe for the kids to swim in?
Yes. SWGs simply aren't designed to crank-out that much FC on a consistent basis.I turned the swg off last time I did the slam. Is that what you recommend?
That may be a real possibility ... for now anyways. If you do a new SLAM, hopefully it will be a quick one and then you can simply follow the "Non-SWG Pools" portion of the Chlorine/CYA Chart. Your CYA is probably elevated because you were using the SWG, so make sure to increase and maintain the FC at the correct level listed on that chart. You can do that for a while to see how things are going. It's possible the SWG is simply not working properly or showing signs of failure. Doing manual bleach additions might be a good way to confirm.I almost feel like I'm having trouble getting the swg to keep the FC stable and that it would be easier to not use it.