A few questions:
Pool store is having a sale and has the 12.5% on sale for 4, one gallon containers for $14. Is this a good price worth stocking up?
Also, I noticed that they also have the powdered stuff (no di-chlor or tri-chlor like the powdered shock I usually see) - what is a good price for those one-lb. bags? All chemicals are 25% off, so I thought it might be a good time to stock up. Does the powder stuff have a good shelf life?