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I have a residential customer with an in-ground, 35,000 gallon vinyl lined pool. They have an older Outdoor Pro wet end connected to a single speed RECHAMPS--115 1.5 HP motor (US Motors 1081 POOL MOTOR). The thing is making a lot of noise and the flow has plummeted to nearly nothing. As the...

Thanks to you I have the starch-iodine commercial bleach testing kit from Taylor. Using that, I could test the step 1 solution? I think that would result in a fraction of 1%. 10 ml of distilled water then? By the way, every time I have tested my barreled sodium hypochlorite, it has been ≥ 12%.

I have a commercial customer that uses Accu-Tabs for chlorinating their largest indoor pool. They think that their more recent deliveries of tabs lack the punch of the originals. Is there a way to dissolve X grams of cal-hypo in Y ml of distilled water to see if the tabs are up to the 65% to...

Mostly as an experiment, I have taken on one residential client. They have a 35,000 gallon vinal lined, unheated, uncovered backyard pool in central Mississippi. They have been chlorinating it nilly-willy by tossing trichlor tablets into their skimmers. Their CYA is presently at 67 so they...

No. I have not been rinsing it because I didn't want to get it wet. At one location, I do one pool right after the other. I guess I could rinse AND dry it between uses. My little 10g DPD powder bottle has a "gasket" made of a pretty flimsy rubber band. My ¼ lb. stash has a better seal. The...

That's interesting. Has me thinking popsicle sticks. Is the inverse also true? If it is pink, have you put enough in or do you have to get to the couple of undissolved grains swirling stage for the rest of the test to work? I use this test (and a lot of others) on all four pools almost every...

I never got an answer from Taylor about that one fluky series of FAS-DPD FC tests I encountered back in March. It is now the only chlorine test I do unless I am demonstrating the straight-up DPD method to one of my lifeguards. I love having a confidence level in my results give or take 0.2...

Thanks AJW and Lake Placid. Always learning new things here. I knew to try to get to CH targets before TA but have always treated CYA in a silo. Unfortunately, I have no surge pits or tanks in my four-pool collection. The other two are indoor pools.. No CYA.

I have just drained, cleaned, plastered and refilled my "smaller" 150,000 gallon outdoor pool in preparation for reopening in May. As I dump 50 lbs of CYA and 400 lbs of Calcium Chloride into the pool just for starters, I start thinking about erosion feeders. The way I am doing it is to pour...

I talked to a very nice lady at Taylor yesterday. She—like me—was puzzled and asked me for lot numbers on each reagent and the FAS-DPD kit they just sent me. They will do some testing on their own and get back to me next week. I made the original post because FAS-DPD seems to be a cornerstone...

Yes. The device would have to remember its accumulated "hot" time through power outages. Thes outlets will be "cold" way more than 75% of the time. Frank is pretty reliable and the only one who taps new barrels. He will remember. Each pump pumps 15 gallons per day. When the two sanitizer...

We are using DPD reagents 1, 2 and 3 and a low range comparator to measure FC and TC from which we can derive CC. We have been doing it 3X per day for all of the 20 months I have been active here. I've rarely had reason to doubt the results we are getting from these.

Thes are indoor public pools. No CYA in either. The one that is giving me FC results I don't believe is my 30,000 Therapy Pool which we keep at 90°.

I teach this stuff (DPD FC, TC and pH) to about 30 lifeguards per year. I'm sure they would tell you I am totally OCD about doing every step EXACTLY right. The vials are new and I rinse them and the stir bar thoroughly between tests.

I am testing both with FAS/DPD and getting .4 for CC in each pool. This is consistent with what I have been seeing with DPD for the last 18 months--Nearly always between .25 and .5. We run about 60 bathers through each pool every day.

They just arrived direct from Taylor last week. DPD Powder and R-0871 Expire 5/24. R-0003 expires 1/25. I'm going to reach out to Taylor again this morning.

Yes. I am using a speed stir. Also using a 25 ml sample in a bid for greater precision. Over 2.5 PPM it seems to work just fine. At and under 2, it seems to fall apart. Light pink ... two or three drops ... boom. It's clear.

Because with multiple tests on multiple samples I was getting a 2 with DPD and the ORP value of 784 at a pH of 7.5 is also indicative of a PPM level of 2. So I have two values that agree and one that seems way off. There also seems to be an assumption out there that FAS-DPD is the only way to...

In the summer, I have eight pumps drawing liquid chlorine and muriatic acid out of six barrels in three locations. The chemicals are dispensed automatically as required and those requirements can quintuple between opening in May and the heat of July and August. All of this leads to a lot of...

I recently got certified as a Chemtrol field service rep and got my two Chemtrol 250's online again after years of disuse. This has allowed me to target my free chlorine levels in the 1.5 to 2.5 range without fear of dropping below one. We use the standard Taylor DPD chlorine reagents for...

Everything is at the same elevation except for the end of the discharge pipe which is about 5 feet below the pool deck.

Update: Took suspect valve out of the system on Tuesday. It looked fine to me. I left it out so there is a 2-3" gap where it was. I got 3" of rain at my house in Brandon on Wednesday. NWS says Clinton got 2" (at Hawkins Field—a nearby airport). All pumps still off. I want to conclude that...

By the way, I am learning this as I go but did have one advantage over most of you knuckleheads. I have the smartest father in the world!

Wow! Thanks for all of the help! I didn't go to that pool today. It is a 45-mile round trip, but I will go tomorrow. By noon tomorrow, the water level should be at or below the bottom of the skimmers. I'll measure the water level in the pool and the flow rate at the end of the discharge...

It is a 6" pipe with a ragged edge. I'm wondering . . . I introduced air into the pump room piping would that stop the system from sucking water out of the pool?

This is what the set-up looks like. Valve 2 is in the lower right hand corner. 1 is upper right. 3 upper left. 4 lower left. I believe the pipe that leads to the drain pipe is the vertical one just left of valve 3 and right of valve 4. It disappears into the floor just beyond the bottom of...

This pool uses 4 6" butterfly valves to redirect flow. I created this crib sheet to keep me straight on how to do what: In an earlier attempt to fix this problem, I replaced valve 3 which was not closing completely. I am now thinking valve 4 is the culprit. Nonetheless, I find it totally...