Recent content by Old Guard

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.