Are pre opening test results accurate?

SUNOFTHEBEACH

Well-known member
May 20, 2008
95
Waldorf, MD
I have a mesh cover. Rain water and much dust and pollen pass through. I probably add/replace 1/4 of my water with rain water and snow.

my pool started turning green and I hit it with 2 gallons of 10 % bleach. The water looks clear, it’s cold and I can see dust covering the bottom.

I thrown in a little giant pump to move the water.

when I tested the water I got 3 ppm chlorine, 60 alk, 180 cal, and above 8 PH.

is there something about the above scenario that makes the PH read higher then it really is? Dead algae?

can I trust that reading?

should I add acid or wait until I open the pool clean it and retest?
 
Last edited:

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,959
Northern NJ
Wait until you open the pool to make any chemical adjustments. Water and chemicals can stratify when still. Get it well mixed before testing.
 

SUNOFTHEBEACH

Well-known member
May 20, 2008
95
Waldorf, MD
I jumped the gun and put some acid in there. My next PH test looked even darker red. Then I tested it with an uncalibrated PH meter that I just changed the batteries on and got a PH of 7.3
 

SUNOFTHEBEACH

Well-known member
May 20, 2008
95
Waldorf, MD
Just checked, my R0004 is just an old bottle that I emptied and refilled out of a 2 oz bottle that didn’t fit in my case. The 2 oz bottle expires 7/20 and has never been outside.

it would nice to know I’m getting alkaline water out of the tap though.