free chlorine

  1. S

    SLAM - Struggling to get to FC shock level

    Howdy TFP, I've been trying to get my pool to Shock level for the past 36 hours with little success. The pool math app keeps advising to add 2 gallons of 10% chlorine every time I test but I can't seem to get above ~2 FC. I'll even test 15 minutes after adding to see if I get a quick spike but...
  2. G

    Total Chlorine supposed to be within 0.2 of Free Chlorine?

    I test on my own but I do like to get a test from other locations to compare my yearly test kit and see if they're close. I brought some water to Leslie's just to get what they think my levels are at and compare and that brings me to my question. On the paper they have Free Chlorine (Ideal...
  3. J

    Complaints of chlorine stinging eyes

    I’m getting control of my pool water with the TFP method. Slowly but surely my numbers are getting in line. Anyway, my CYA isn’t outrageous but it’s higher than it should be. I’ve been following Pool Math App for keeping FC in the right range. Ultimately that’s meant my FC is higher now than...
  4. W

    SLAMming first timer

    Hi all- new homeowner & new above ground pool owner here! 👋 My FC was 0 so I decided to SLAM. Based on the CYA chart, my shock FC is 20. Does that mean I should be maintaining a 20 FC throughout the slam? That’d be a TON of bleach. I’ve already gone through 10 (121oz) jugs. I’ve been more or...
  5. A

    SWG Intex pool in the shade - high FC

    We have an intex 4500 galloon pool with 1200 gph sand filter and intex swg. Our pool is in the shade, basically always. We have a wooded backyard. I really think the shade affects or FC loss, which is very little. Lately it has been raining a LOT (midwest, MO). I have been running the filter...
  6. A

    Need help getting FC raised before I turn on SWG

    Hey all. I renovated my 30,000 gallon inground pool this spring, new plaster went in May 28, 2021. I have an Intellichlor SWG that I’m hoping to start using soon. I’m having trouble getting the FC level up before I turn on the SWG. I added 4 gallons of bleach last night and here are my levels...
  7. B

    Consistently Low FC Levels with AutoPilot - Are High Phosphates to Blame?

    Hello! I am grateful for any help here - I feel like I've been running in circles and have gotten opposing answers from local pool stores and experts I've consulted. I have a 26k gallon, vinyl liner pool with AquaCal AutoPilot DIG-220 with a PCC 1 salt cell I had the salt generator installed...
  8. O

    Chlorine adding calc troubles with Taylor Test Kit K-2006

    Hey team! My pool's free chlorine level is 3.5 and I'd like it up to 5. Before I got rid of my $$$ pool company, they were adding on average 2 gallons weekly. However, when I used the chart at the back of the Taylor test kit (and confirmed with the Pool Calculator) it only suggests adding about...
  9. TheBigBlueFrog

    Variations in concurrent same-hour FC results

    What are things I need to look for if I'm getting pretty wide variations in FC when tested just a few minutes apart? I tested using DPD and got a FC of 4.5. I tested again, with a different sample bottle, in the same spot in the pool. I got 6.0. I figured "best two out of three" and tested...
  10. K

    Free Chlorine Issue : Water Chemistry

    Hello, I have a relatively new saltwater pool (11/1/2019) that I can't seem to get back into balance. As a result of allowing my CYA levels to drop to zero, my FC levels quickly followed (Florida sun). In an attempt to get my CYA/FC levels up rapidly, via stabilized chlorine tablets &...
  11. K

    CYA going high and high

    5 days back I thought to test water from pool supplies store, so I went with water sample and came to know that CYA is 125 out of my 28000 gal pool. So person suggested me to drain 1ft of water, so I drained and refill 1.5 feet and then went back for testing. This time FC was low and CYA came...
  12. C

    First TF-100 Test Results! Questions/advice...

    I just got my test kit and did the full battery (I think). Results: FC: 1.5 CC: .5 TA: 150 Ph: 8 CH: 1 CYA: 40 Pool: ~30k gallons, vinyl. I used pool math to calculate bleach addition, and addition of low n slo I still had. I have read the ABC’s of Pool Chemistry and most of the articles in...
  13. L

    Working on opening salt pool - need some advice

    Hi folks! Just recently filled a Saltwater pool and am working on getting it leveled out. Got a TF-100 kit. We filled the pool on 5/18, added 100lbs of salt on 5/19, then after the salt dissolved after two days we put our pump on it’s “BOOST” mode and let it do its thing. Initial test showed...
  14. A

    FC not increasing - am I doing something wrong?

    Our friends recently purchased a house with a neglected pool that is 21000 gallons - pump was broken and when we opened the tarp it was a nice dark green with all sorts of debris inside. I offered to help and got the pump replaced without any issues however am really having a hard time starting...
  15. bmdelaune

    Relationship Between FC and CC

    TLDR; I started SLAM last night. ~80 CYA, started at 0.3 ppm Chlorine, 7.5 pH. Dumped 4 gallons of 10% bleach. After it was dark (about an hour after dumping) FC read 34 ppm, CC was 1 ppm. This morning before the sun was up, FC read 22 ppm, CC was 0.5ppm. What is going on here? My novice...
  16. J

    0.5 ppm CC with increasing FC

    Bit of newbie here that has been testing and maintaining his own pool water with a K-2006C and pool match for over a year now without any significant issues or even any issues to note at all. I have read all of the documentation on the site in the past and did a bit of a refresher today, but I...
  17. mkmscr

    Thoughts on CSI and FC

    Curious, TFP pool app is suggesting my CSI is setting conditions for corrosion to begin with a CSI at -0.6 is that correct? My PH is about 7.6 and my TA is about 65. CH is a little low at 250. I understand PH can help adjust CSI but I generally don’t go much higher. Thoughts or am I okay...
  18. Earthman Bob

    Winterizing with High CYA

    I tested for CYA .... maybe about a month ago, and it was low, so I added the recommended amount. Just tested it again now, and the level is 90-100. (Don't know why that happened, but that's not the point of this thread.) I'm getting ready to winterize, and Poolmath says I need to add 11...
  19. D

    Non-Chlorine or Chlorine Shock

    So over the last week I had noticed that the deep end of my 16x32 pool had become a little murky, after testing it i realized the chlorine had gone now to almost nothing. I use a floater with three inch pucks to supply it. I refilled the floater and added a granular cal-hypo to try and quickly...
  20. PointeTaken

    Science of "safe to swim up to SLAM level"

    First of all, let me begin by saying this isn't an indictment or skepticism of this community or the TFP methodology. This is a genuine open-ended request for more detailed info mostly out of curiosity, and also due to the fact that a lot of the concepts and principles on this site challenge...
  21. PointeTaken

    Can't get FC to drop in SWG pool

    Hello everyone, New to the forum, new to pool ownership, not new to pool maintenance but not a hardened veteran either. For a couple of years many years ago, I was a manager at a large public pool, so I understand fundamentals and definitely know how to properly test chemistry. We recently...
  22. R

    Vinyl pool..above ground cya and chlorine

    I am getting differing info everywhere. I have an AG pool with vinyl liner. Cya is at 30 using call hypo as main sanitizer. Question is..the pool math calculator says to keep fc btw 2 and 6 at 30cya. All websites seem to recommend keeping fc btw 1 and 2.5 for vinyl liners to keep them in good...
  23. J

    High FC Loss during daytime

    Hello all, It's my second season of owning a pool and first season following the TFP method. So far everything has been going pretty well, everything is balanced, but the issue I'm running into is high levels of FC loss during the daytime. Below are my current test results: PH: 7.5 ALK...
  24. J

    Jack's Magic - False FC Readings?

    Hi all, I did the Jack's Magic "O2 Safe Shock & Stain Solution #2 Treatment." In the instructions, it says that the treatment can produce false FC readings for 3-4 weeks and that I should use the TC readings during that time. I'm fine with this, but want to make sure I'm doing this right...
  25. Chemingway4

    New to TFP (Kind of) Question about CH after Pool Refill (pool store didn't want to sale me anything!) and daily Chlorine loss

    I recently drained and filled my pool (3 weeks ago). The CH reading is 80ppm. I know that's low, but when I went to the pool store to get supplies, I was told not to worry about the CH as it would slowly rise over time. I thought it was odd that they didn't want to sale me anything, so I left...