free chlorine

My CYA has been tracking high. It started at 145 a month ago and I am now down to 118 through dilution with fresh water. Pool Math is recommending target FC from 9-15 and I imagine that it is because my CYA is so high, however, the target has not dropped as my CYA has dropped. As of today, my...

Update: I started following the SLAM method. Have used almost 9L liquid chlorine in 5.5 hours. Does this sound crazy ? 11am free chlorine @ 0. Added 2.8L liquid chlorine and got it >10. 2.30pm free chlorine @ 0, added 3L liquid chlorine. 3.30pm free chlorine @ 8. 4.30pm free chlorine @ 0...

Something odd I noticed this year vs. my previous 5 years. I'm adding less salt to my pool.? My logs show I've added 220 lb this year, 280 last year and 320 the year before. Throwing out the 280 last year due to a leak getting it repaired, if I look at 220 vs 320, that's a considerable...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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 &...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...