One doesn't typically find elemental sulfur in water. Sulfur almost always comes in the form of dissolved hydrogen sulfide gas which gives water a rotten-egg smell. H2S is processed by using UV light and peroxide based chemicals to oxidize it into sulfates. Sulfates in contact with high hardness water (calcium) will create calcium sulfate scale which looks powdery white, not black. If ascorbic acid is lightening the stains, then they are likely iron-based.
At this point, you need to forget about the stains as they are aesthetic and not a hazard. You need to SLAM your pool to get rid of all the algaecide that was added and causing your foaming issues. As
@Texas Splash said, you're in a pickle and you need those testing reagents. So you need to focus on getting those whatever way you can and then get a SLAM going to correct your water issues. Everything else should be put on the back burner until you complete a SLAM.
Joyful Noise- this is a copy of what I sent Texas Splash. ( I didn’t know how to tag then, but I just found out how!!


) I’d appreciate your feedback about the Taylor Reagents…(and anything else you want ti chime in on!!

Thanks! Patti (message below)
Patti, I caught up with your posts. I applaud your efforts to find a root cause to your problems, but remember, it's fruitless without a proper test kit. Some of the theories you noted above may have nothing to do with your situation, and you'll end up driving yourself nuts. To put it into perspective, we have literally thousands of pool owners here in the southern part of the US whose pools are close to seal level with extremely high water tables. With a strong storm the pool is 100% under storm water. I don't think I've ever encountered a situation where the staining was from that water. A liner is fairly thin, so in theory something dark might be leave a shaded spot, but I'm more inclined to focus on the water you can control and test. The copper is definitely a legitimate issue and it's good you stopped using it. Unfortunately it may have already added enough copper to cause problems.
In the end though, I personally wouldn't worry about the stains right now. I would focus on obtaining a TF-100 or Taylor K-2006C test kit first, then take actions to balance your water properly. If there is algae, we'll coach you through a
SLAM Process. If the CH is indeed too high, we'll show you how to reduce that as well. But it all starts with the proper testing. That's where I would focus my efforts rigth now.
Yup! I do have the K-2006 (FAS-DPD) kit- but was having trouble finding the replacement reagents. I found one that a fellow Ontarian recommended, so I was just making up my list to order.
Is there any significant difference between the K-2006 kit and the K-2006’C’???
I ordered this test not this spring, but the spring before that. When it arrived some of the reagents were outdated and others were not far off- BUT the retailer refunded my total cost- and let me keep the whole kit.
Most of the reagents now have 2020 dates on them…but I really can’t afford to replace every single bottle right now if I can get away with it…
Do you know if there are any that ‘should be okay’ to use with the April 2020 date- and those that DEFINITELY have to be fresh?
I will try & tag Joyful Noise about this as well (not sure I know how!) But I’m hoping his knowledge of chemistry could help direct me!
Here is the list of reagents in the kit (some of which I’m out of so will have to replace anyways):
FREE & COMBINED CHLORINE:
•R-0870 DPD Powder
•R-0871 FAS-DPD Titrating Reagent
•R-0003 DPD Reagent #3
pH TEST:
•R-0004 pH Indicator Solution-phenol red
•R-0005 Acid Demand Reagent
•R-0006 Base Demand Reagent
TOTAL ALKALINITY TEST:
•R-0007 Thiosulphate N/10
•R-0008 Total Alkalinity Indicator
•R-0009 Sulfuric Acid .12N
CALCIUM HARDNESS TEST:
•R-0010 Calcium Buffer
•R-0011L Calcium Indicator Liquid
-R-0012 Hardness Reagent
CYANURIC ACID TEST:
•R-0013 Cyanuric Acid Reagent
***For the Calcium Hardness Test…
I used the smaller 10ml sample size and I still ran out of the Reagents after just a couple of tests because my CH is over 800+++ (according to the strips).
I know it is high…so I don’t want to keep putting out money for the reagents if I already know it will be off the charts.
You mentioned something called Cal-Hypo??? If I use this product is it going to throw other levels out of whack? Will I have to compensate?
What exactly is it (besides a calcium reducer or eliminator) and do you know of any other brand names it might go under? (Being in Canada, quite often we can’t get the products you guys in the States use- ie. I can’t get Metal Magic up here and couldn’t find any U.S. Retailers - or even the distribution company itself- that would let me order from them!!
So, while it’s great that people discuss products that work for them…it would be SO HELPFUL if people could include other brand names that have the same ingredients. If they don’t know of any other brand names, if they could at least post the ingredients, it helps us here up North to search for products that have the same chemical composition. It IS time consuming though, and I never did find a Canadian equivalent to Metal Magic.
Is there a page dedicated to Resources/Useful Links? where Info like that could be added??
If members could share that kind of information -about comparable products and/or specific ingredient lists, and other pertinent info such as: supply companies that DO ship to Canada, or names of retailers they know of in Canada, or places that have good prices/sales on products… that kind of stuff- it would be SO helpful!!!
I would have loved to have a resource like that rather than wasting weeks contacting the manufacturer numerous times, waiting for responses, and never getting any after initial inquiries were made.

And I spent a lot of time contacting U.S. Retailers, Amazon sellers etc too….which all proved fruitless. I’ve been trying to get on top of this for almost 2 months now…so I’m sure you can imagine my frustration!!
How long should I keep the FC at 5 before we do the SLAM? (Or- I guess we will do it as soon as I get the reagents?)
One more question…I got some bleach yesterday. However, it didn’t have the breakdown of ingredients on it like the Purox and liquid chlorine jugs did.
Should I assume it will contain the same ingredients & amounts??
Is this used to shock with? (as opposed to the powder granules I’ve used in the past).
How do you know how much to put in? What should your FC and CC levels go up to when you shock? If you add 2 jugs say, how long do you wait before testing the water? Will shock levels affect other readings? Do I just ignore those until the FC is back around 5 and start testing then? I’ve never used liquid chlorine before, so this is all new to me! After it’s been SLAMMED and I get it balanced, When can I start using my chlorinator again? I assume I start dispensing at 1 and monitor (daily? Every few days?) and gradually turn it up until I consistently get 3-5ppm readings?
And if you know anything about the shelf life of those reagents, I’d appreciate your input!
THANK YOU!!!! THANK YOU!!! THANK YOU!!!


