Im new at testing chemicals so here it goes. Two nights ago we started the BBB as we just filled our pool. I have started with dichlor in the appropriate amount for the last two nights. I've been testing chlorine and ph nightly. Not sure if I'm supposed to check the cya yet or after the fourth night. So I just tested it and my question is about the black dot on the bottom of the test tube. Does it visibly go away from waist level? It never looked like it did but if I held it just in front of my eye, the blot dot was faded in the middle but not the edges. What should I be expecting with this? Thank you so much.
C.A. View tube question
- Thread starter Edn35
- Start date
- Jun 14, 2012
- 2,668
- Pool Size
- 13500
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool Edge-40
Even if your test unit doesn't look exactly like this - it works the same way.
http://www.taylortechnologies.com/chemi ... ntentid=44
http://www.taylortechnologies.com/chemi ... ntentid=44
What is important at this point is the calculated value for CYA. It may take a week or more for the CYA to show up on test so just keep a running total of what has been added. Use that calculated CYA for your values in the calculator and such until a week or so has passed, then test.
I find that the lighting for this test is really important.
I find that the lighting for this test is really important.
I had the same thing. Just set up the pool on 7/22 and used the pool school recommendations and added 8oz of dichlor for four days. I tested CYA on day 5, and I got <20, when I thought it should be just above 30 based on the pool school article, and the pool calculator.
So just for clarification, even when adding CYA by using dichlor, it will still take up to a week to register correctly on the test? I guess I assumed that was only for straight CYA, not for dichlor.
Thanks.
So just for clarification, even when adding CYA by using dichlor, it will still take up to a week to register correctly on the test? I guess I assumed that was only for straight CYA, not for dichlor.
Thanks.
Keep in mind that depending on ambient light, your interpreted CYA value can be +/- 10 ppm.
I tested twice, once indoors, and the second time outdoors in full sun, with my back to it. Both times I filled the tube, and could still slightly see the black circle at the edges. It never fully disappeared. Both tests were with Friday's water, so I will try again tonight or tomorrow with fresh pool water and see what I get.
- Jun 14, 2012
- 2,668
- Pool Size
- 13500
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool Edge-40
- Jun 14, 2012
- 2,668
- Pool Size
- 13500
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool Edge-40
hofmanns said:
32oz of bags? What percentage of dichlor is in each bag?
If those bags were 100% dichlor you'd have about a 30 CYA ppm rise from where you started.
(based on the 4000 gallons you list)
It's 99% according to the active ingredient label, and it was from a container marketed for spa/hot tub sanitation "SpaGuard Chlorinating Concentrate" a BioGuard product.
I expected about 30ppm rise, which is why I was surprised when I measured <20ppm.
I expected about 30ppm rise, which is why I was surprised when I measured <20ppm.