My Cart Cart

Rising pH In A Pool

Things that cause rising pH in a pool:


  • Phosphates in the pool water
  • Filter needs cleaning
  • Water imbalance
  • Poor water circulation
  • Algae 

Items needed to fix rising pH in pool water:



How To Fix Water Balance and Phosphates

1)  Test pH.  Knock the pH down to the low side of the 6.6 - 7.0 range (6.6)

2) Test Copper.  Bring the copper up to .4 ppm - .7 ppm.  If the copper does not rise above .3 ppm, test the calcium.  Bring the calcium up to 400+ ppm.  

3)  Test Phosphates.  Make sure they are under 200 ppm.  If there are any phosphates in the water use a recommended phosphate remover.

4)  Use 1 quart non-metal algaecide during daylight hours - best in the morning.

5) wait 12 hours and use 5 lbs per 20,000 gallons of pool water non-chlorine shock  (potassium monopersulfate).

6)  Wait 24 hours and if thepool isn't 90% clear, add another 5 lbs per 20,000 gallons of pool water non-chlorine shock.

Filter Cleaning

Sand Filter With Sand or Glass:

1)  Take the top off of the filter and examine it.  Take out debris and check for dips in the media that might indicate a broken lateral.

       a)  If the filter is a sand filter with sand, pour a couple gallons of liquid acid in the filter covering the media.

       b)  If the filter is a sand filter with GlassPack Filter Media, pour in 2 gallons of regular household bleach, covering the media.

2)  Let the filter sit overnight and then backwash to waste.

DE Filter:   

1)  The filter should be broken down, the grids removed and soaked in a 2 parts water to 1 part liquid acid solution for 12 hours.  

2)  Reassemble the grids 

3) Add DE powder.

Testing Circulation

While the pump and filter are running, place a beach ball (or something that floats) on the surface of the water and watch how it moves.  If it gets stalled someplace that means the pool water isn't circulating effectively.

Make sure all return jets are pointing straight to the middle of the pool, not up, down or sideways.

Must be logged in to submit questions