1. Test the pool. When chlorine is above 2 ppm and pH is between 7 & 8, they can swim -- if the water is clear and not slimey.

2. Test your CYA level; sounds like you need dichlor to add some CYA (stabilizer).

3. If it's a new pool, call Intex for replacements on the SWCG. Otherwise, forget about it -- it's not that hard to run it manually.

4. Read the muriatic acid page linked in my blue signature box. Get a jug. Fix the pH.