Connie, please don't make me have to look up your zip code to figure out where you are? Just put a location. Thanks!
Are you sure this is black algae and not just algae that looks dark?
What did you do to get rid of it last year?
How do you sanitize your pool?
Can you tell us:
and which test kit you use?
Thanks in advance-
Yes they are TF100 results. It was not cloudy at all. I did it twice but it was not room temp. I had taken it out of cold pool. I will get CYA tomorrow. I don't have that. I am assuming pool store. Is my pool sweeper ok to put in water as well while cya is in there and heavy bleach? Sorry I am not savvy I went to a pool store for years and just did what they said. Hasn't worked out so well and a lot of money wasted.Are these TF-100 test results?
For the CYA test, was the test cloudy at all? If so, add 20ppm CYA. If test was totally clear, then add 30ppm CYA. Add the CYA to a regular sock and hang it in front of the return. Make sure it doesn't touch the wall. Leave the pump running 24/7. Just to confirm, the pool water was room temperature when you did the test?
pH needs to be raised. You can do this with aeration and it is chemical free. Aeration can be done via spa jets, waterfall, fountain, return pointed up so it breaks the surface, air compressor, etc.
Once you have the sock of CYA in the water, add enough chlorine to get to 10ppm FC. Test and re-dose with chlorine often. Brush and vacuum the walls and floor daily to allow the chlorine to get to all parts of the algae.
Follow the SLAM Process procedure.
We have drained it the last two or three years because it has been a mess. That's why I am finished with the pool place. I did add the liquid chlorine and borax. Looking beautiful. I added the CYA Tuesday and everything looks good for the moment. My cya is now a 40. ph went from 7.6 to 7.2. Unsure why. fc is really high on the tester 5-10Did you drain your pool recently? Your test results indicate you have almost non existent CYA which is usually thru the roof after years of disinfecting pool with pucks or pool store dry type shocks.
Add some liquid chlorine to your pool ASAP.
I didn't see this in time Monday. Looking good now. Did add the CYA.CYA can be found at the PS or Walmart. At Walmart, it is sold in 4 pound containers in the pool section. That is usually good stuff to use.
Walmart also typically has a good deal on their 10% chlorine in the pool section. check pricing for singles vs multipack. sometimes one packaging variety is priced better. Check date codes such as 19XXX. With 19 being the year of manufacure and XXX being the day number of the year. Get the most recent chlorine you can find.
A slight modification to my advice provided above. Before you add the CYA, I would like you to run a test. Add enough chlorine to the pool to get to 10ppm, in front of a return with the pump running. 15 minutes later take a sample of pool water and run a FC & CC test. If the FC is above 5ppm, then add the CYA. If FC is below 5ppm, then report back to us for additional advice. The 15 minute interval is important (don't wait hours).
I am sorry I did use the FC tester. That was the ph and chlorine test. My new readings are as follows:You stated you have a TF100. Always use the FAS-DPD (R0870 and R0871) to test your FC.