Explain this 12% SH thing

Might be seasonal or regional. I noticed the same here.

Thanks for the tip! Lowes had some stashed away outside in the garden center.

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Look for a wholesaler pool supply company in your area. They will have the 5 gallon jugs an 2 1/2 gallon jugs more than likely 15% too.

I’ll check into that, although the two I called are closed for the winter.

My local pool suppler only had 9% in 1 jugs. Luckily there is a chemical supplier not too far away.