"X" LBS PER 10,000 GALLONS OF WATER: When making chemical additions, you can only add "X-amount" of the chemical per 10,000 gallons of water AT ONE TIME. This maximum amount that can be added at one time is typically specified on the label of the chemical packaging. Once tested, read the instructions on the label. If the amount that you need to add is higher than the maximum amount that can be added at one time (per 10,000 gallons of water), then you will need to add the chemical in increments, waiting at least 6 hours between additions .

*Here is an example (using raising the Alkalinity):

You have a 30,000 gallon pool. From your test, and from reading the instructions on the label, you determine that you need to add 23 LBS of Alkalinity Increaser in order to raise your Alkalinity into the desired range. The instructions on the label also specify that you can only add "4 LBS per 10,000 gallons of water" AT ONE TIME. Since your pool is 30,000 gallons (or 3 times greater than 10,000), multiply the maximum amount (4 LBS) by 3:

4 LBS per 10,000 gallons of water

x 3

12 LBS per 30,000 gallons of water

*From this example (of a 30,000 gallon pool), 12 LBS of Alkalinity Increaser can be added AT ONE TIME. Since the example stated that 23 LBS had to be added altogether, the remaining 11LBS must be added later, waiting at least 6 hours after adding the original 12 LBS.