Swimming pool ph went up after a swim party... normal?

Your PH and chlorine levels can all change due to heavy use, temperature and sunlight. Yep, likely normal but what was it and where did it go?

Did you have a heavy rainfall after the swim party ? This could be the reason, many things effect the Ph of your pool. This is information Ph from PoolMaintenance.com and should help you: Do you have a test case to determine how high the Ph is?

Ph


Ph is a measure of how acidic or basic the water is. PH is a logarithmic scale from 0-14, with 7 being neutral. Below 7 and a substance is defined as being acidic, while levels above 7 are said to be basic or alkaline. Everything that enters your pool has a pH value. Ever heard of acid rain? This is rainfall with a very low pH. The human eye at a pH value of 7.35, is just slightly basic. This is, coincidentally, in range with proper pH levels for your pool. To have pH in balance we adjust the water with additions of pH increasers (bases) or pH de-creasers (acids) to achieve the range of 7.2 - 7.8. If your testing (recommended daily) of the water shows a pH value below 7.2 the water is in a corrosive (acidic) condition and you will need to add a base to bring the pH into a more basic range to prevent corrosion. Conversely, if the pH is above 7.8, we are in a scaling (basic) condition and must add an acid to bring down the pH to prevent the formation of scale.

You didn't say whether it was a chlorine or salt water pool. I'm new to pools - just got my gunite with salt and DE filter this summer 2010. Before we could convert to salt we had to run chlorine for 30 days and I found that after a lot of activity, you want to shock the pool. This was amazing and the next day the water was crystal clear and all my chems were perfectly balanced - chlorine and PH. I would def shock after a heavy rain and a large party.