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Greetings. Wondering whether a UV-reflecting pool cover would decrease rate of UV-induced FC loss? Any experience appreciated. Regards,

I just noticed a rapid stream of bubbles from a crack in a pool step. Any ideas? Thanks.

Greetings, pool chemistry buffs. Anyone have any ideas? My first pH reading is often way too low. The second reading makes more sense. Same rinsing with tap water 3x, then with pool water 3x, same pool water sample. Thank you for your consideration. Cheers.

Hi, all. In the cooler months my pool's pH seems to stabilize at 8.1 - 8.4. The CSI at this level is fine. Is it OK to let the pH sit at this level? Thank you for your consideration. Current readings: pH 8.2 TA 90 CH 225 Salt 2400 Borate 40 CYA 45 - 50 (I put 47 in Poolmath) Temp 67

I wish I’d paid more attention 10 years ago when I first noted small bubbles coming from the return jet closest to the pump. Today, when a major air leak forced me to replace the lid and o-ring, lo and behold: the inside of the basket is calm and peaceful while the pump is running. Somehow I’d...

Greetings. Its been some years since I bought LaMotte borate strips. Just now running out. What is the best current suggestion for borate testing? Thank you as always. PS- as soon as my pool breaks the 80 degree mark, I'll jump in. Currently 76 degrees, too chilly for me.

Greetings. I've asked this years back, but now I'm into uncharted high pH territory and I want some opinions. As you'll see, my CSI is fine. And I figure, if I don't have to go out in the cold and add acid, I won't. I'm lazy. Thanks. pH 8.5 (approx. as 8.2 is top of the color scale) FC 5.5 TA...

Greetings. I have always noticed a large daily drop in FC during the summer. Up to 5 points is not uncommon for my pool. However, it seems to be even more lately. I target FC at 7.0 every morning. This morning's reading, pre-chlorine addition, was 0.5 points. 6.5 point loss during the day? Wow...

Hi. I don't have a smartphone and use my Apple desktop and laptop to run Pool Math web page. Is this still current? I'm seeing info. about an app with updated suggested chemical levels. Thanks.

A puzzler: My first attempt at FAS-DPD often gives me a ludicrously low FC. Then I wash and refill minutes later and voila! I get "the result I want". Same water, everything. Example: today's first FC was 2.5, CC 1.5. Then FC 4.5, CC 0.5, then FC 4.0, CC 0.5. This happens 50% of the time. Anyone...

Greetings, fellow travelers and pool owners. So my CSI is still fine with pH 8.3. But how high is too high as regards pH's effect on the pool's infrastructure? Thank you. Today's readings: FC 5.5 TA 100 CH 200 CYA 30 Temp 62 Salt (from 9/19) 2400 Borate (from 9/19) 40

Every year I go through my early season dis-belief at how much my FC goes down every day. Right now it seems to go from 6 to 2 (or lower) every full sun day. The house is on the east side of the pool and large trees on west but for at least 8 hours the sun hits pool directly. I am now onto a new...

I inadvertently purchased Taylor pH Indicator Solution (Phenol Red) R-1003J, C Size: 60 ml (2 oz), expires 02/19. After experimenting with it and determining I could not use it, there remains approx. 2/3 bottle. If you want to split shipping cost, its yours. Thanks and regards to all TFPers.

Seems I bought a 2 oz bottle of R-1003J for refill. Can I use this in TFT-100 test kit comparator? Thanks.

Greetings. I seem to understand that raising my CYA for summer full sun will be an advantage. I am currently CYA 40 and lose 3 - 3.5 FC daily. If I move CYA to 50 or 60, will my daily expense of chlorine go down? Thank you. pH 7.7 FC 6.0 CC 0.5 TA 120 CH 250 Borate 40 CYA </= 40 Water Temp 82F

Does anyone know why I get Invalid Redirect first time I login, and then when I enter info again it goes through and logs me in? I use Firefox. A minor inconvenience. Thank you.

I walked into Leslie's to buy 12.5% chlorine liquid. Standing at the counter, I overheard two customers commiserating over how difficult it was to keep their pool chemistry straight, what with all the conflicting mis-measurements and chemistry correction schemes they were constantly being sold...

Greetings. Just in case this happens to someone else-- Post-Harvey biblical rains I began a preemptive SLAM. My CYA had dropped to 30 from 40 pre-storm. From that point I kept noting extreme daily loss of FC and figured I had occult algae growth. CC averaged 1.0 - 1.5. Water became crystalline...

Hello. I am trying to determine which directions SPA and WASTE are. Normal flow is 12 o'clock. Backwash is 6 o'clock. Labels are worn off. This is a Hayward 4 way valve sitting next to DE filter, about 1998 model. Thanks so much. It will help me drain pool a bit without backwashing. Hurricane...

Just wondering at what point I would need to consider draining water to lower salt. Actually all is going very well. Latest salt reading from Taylor drop test is 2200 ppm. Thank you all for my lovely pool.

I know TFP is not for commercial pools, but can anyone make sense of the results I got today from my indoor swim club lap pool? I do not know what systems they use. Thanks. pH > 8.0 (strange color) FC 26.0 CC 5.0 TA 90 (strange color) CH 375 (color also mildly atypical) CYA 0

I have noticed that when I forget to rinse out the chlorine test graduated cylinder before testing, the FC shows low and the CC high. Then I do a cylinder-rinsed-out-with-pool water chlorine test, and the results show a higher FC and lower CC. Here is today's NO RINSE and then RINSED results: NO...

Do I understand correctly that CSI -0.6 up to 0.6 is OK? That < -0.3 and > 0.3 merely means you are on the warning track but that pitting or scale should not occur? Thanks.

I typically run CH 275 - 300. I didn't add any calcium intentionally (no Ca shock, Ca chloride). Today I was doing my weekly chemistries and find 400 and 425. What can cause such a jump? Thank you. Here are my other latest numbers: pH 7.7 FC 6.0 CC 0.5 TA 80 Salt 1800 ( about 10 days ago) CYA...

Just curious about the chemistry. Usually once I begin to add R-0009 I notice some stringy precipitates form. What are those, exactly? Thank you.

Would it be possible for Pool School to get more specific on differentiating MA from GA? Multiple photos of each, more distinguishing features. Thanks.

I just purchased a Taylor K-1766 Sodium chloride test kit. I notice afterwards that there is a creamy bathtub ring left inside the cylinder that doesn't wash away easily with water. Use weak bleach to clean? I'm assuming sticking my finger in and wiping it out is not the smartest way. Thanks.

Greetings. Since it seems difficult to distinguish MA from regular green algae, why not recommend routinely doing a 24 hour MA shock at end of any greenish algae SLAM? / BTW, I always wondered how a case of authentic MA passes the OCLT and low CC criteria of the initial SLAM, before one does the...

In the forum I see orange folder icons and blue ones. What is the meaning of each color? Thanks.

I need help. I began a green algae SLAM 23 days ago. Back then there were 6 or so hand sized patches of algae on walls, water clear. Since Day 2 SLAM no visible algae, water clear. I am unable to reach SLAM completion due to persistence of CC between 1.0 - 2.5, usually 1.5. Running out of ideas...