Initial water chemistry

ericandcrystalh

New member
Jan 15, 2021
2
Tomball, TX
Pool Size
20000
Surface
Plaster
Chlorine
Liquid Chlorine
We are just finishing construction on our pool, approximately 20,000 gallons, gunite and plaster with a pebble finish. PB is doing startup on Monday but I wanted mess around with my TF-100. I tested our tap water and it had a FC of about 2.5. I didn’t test CC but the water has a noticeable chlorine smell which we usually treat with a whole house softener/filter (those have been bypassed for the pool fill).

We are in Houston and about 36 hours into the fill and just about done. I wanted to see what the pool water was at, with no chemicals added, and here’s what I came up with:

FC = 0
PH = 8.2
TA = 300
CH = 125
CYA = 0

The CYA doesn’t surprise me, as I doubt tap water is stabilized. And I assume being in the sun all day, any FC burned off since it’s un-stabilized.

My questions are, for the PH and TA, are those “typical” values when you’re just starting out? As I said, we haven’t added any chemicals except the PB put in about 1.5 gallons of “Startup-TEC” as they started the fill. And CH should go up as the plaster cures, right?
We are excited to be finishing this build which has been about an 18 month design process; although excavation only started on Jan 27th so the build itself has gone pretty quickly.
 

Attachments

  • A57FE96C-C021-4345-92CE-33B8231C2AA0.jpeg
    A57FE96C-C021-4345-92CE-33B8231C2AA0.jpeg
    384.1 KB · Views: 9

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
24,587
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Welcome to TFP and congratulations on joining the pool community.

Your water looks like typical tap water. Nothing surprising.

Follow the PEBBLETEC startup guide linked to in...

 

wireform

Silver Supporter
In The Industry
Aug 15, 2017
2,072
Spring Valley, NY
I'm not convinced on the TA number. That's the one which you need to wipe the tip between every drop especially when new due to static changing droplet size and as with all droppers they need to be perfectly vertical. Also if you're not using the speed stirr may also contribute to using more regent because mixing isn't uniform.
 

ericandcrystalh

New member
Jan 15, 2021
2
Tomball, TX
Pool Size
20000
Surface
Plaster
Chlorine
Liquid Chlorine
I'm not convinced on the TA number. That's the one which you need to wipe the tip between every drop especially when new due to static changing droplet size and as with all droppers they need to be perfectly vertical. Also if you're not using the speed stirr may also contribute to using more regent because mixing isn't uniform.
Aah yes will wipe the tip. I am using speed stir. The color kept flashing and I added drops until there was no more color change. After the 30th drop there were no more changes BUT I did not wipe the tip. Will do that next time fire sure!