Sure. You can use the 10% or you can use some cal-hypo since you have a concrete pool and your calcium hardness level is only 160. (200-400 is the suggested range.) Either way will work.
Re: No Chlorine at all in pool...
Sure. You can use the 10% or you can use some cal-hypo since you have a concrete pool and your calcium hardness level is only 160. (200-400 is the suggested range.) Either way will work.
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