Strictly one drop at a time?


Well-known member
Jul 15, 2007
Say I have tests that I know are going to be in the upper ranges. When I start adding and counting reagent drops, can I start off with 2-3 at a time and then swirl? Or would this chemically affect the endpoint somehow.

Common sense says i'm just being anal, but just wanted to make sure. I also use the 10mL shortcut method with the TA and CH tests.


LifeTime Supporter
May 21, 2007
Carrollton, TX
If I know that my FC is 4 or over, I always add 3 or 4 drops initially then swirl between drops after that. Tried it both ways and the final value is the same.


Mod Squad
LifeTime Supporter
Platinum Supporter
TFP Expert
In The Industry
Apr 1, 2007
Sebring, Florida
Yeah, time to fess up....I shortcut the drops method frequently. If I know I'm 100 plus on CH, I'll rapidfire 10 drops, swirl, and go from there. Same with Free Chlorine and Alk. Lazy and careless, I know, and I got burned twice on Free chlorine when my initial rapid fire drops cleared the solution and I had to do it over again.

I'm pretty sure the total time I saved was easily wiped out by having to repeat the's just in my nature to sometimes take shortcuts when I know I shouldn't. :oops:
poolio said:
on the alkaliinity test it depends on how much you aerate it when you swirl. that could affect it
Since the akalinity test is only measuring the carbonates and bicarbonates in the water and NOT the carbonic acid aeration will not have any effect on the outcome of the test.