Why giving advice is scary!

[DavidD]

I would love to know:

1. What type of test they are doing (i.e. computer, strips etc.) and what brand or trade name the the test are.
2. What did your test show, assuming you have Bens/Taylor kit.

I too have questioned the validity of my local pool stores testing and have had a similar experience. That's why I don't trust anyone's test but my own!

Dave

[waterbear]

I work in a pool store that uses the LaMotte Waterlink Express colorimeter and LaMotte UDV reagents along with the LaMotte DataMate software. I have Ben's PS234s kit at home along with a Taylor K-2005, a Walmart Aquachem 6-way $15 dollar special, a few cheap OTO/pH testers, and various test strips (3 way to 6 way and some speciality ones) from LaMotte, Aquachem, and Aquacheck (Hach). There is also another pool store in my town that uses the Taylor lab for testing. I can tell you that my test results for my pool at home with all the reagent based kits that I have basically agree and also agree with the LaMotte testing done where I work, even if I am not the one testing my water at work. (Everyone where I work that does water testing has to pass the LaMotte Waterlink certification exam before they can test. The exam basically checks that your testing procedure is correct and that you are aware of any interferences that might give strange results, not very in depth but better than nothing). If there are differences between tests they are very small (for example, one test might show TA at 100 ppm and a different one at 110 ppm...certainly withing precision vaiences.

The test strips are useless! I am particularly disappointed in the LaMotte strips. I really expected better from them. The ONLY strip that I have used that proves to be reliable and accurate is the Aquacheck White test strip for salt. Evey time I have checked it has been within less than 200 ppm from a Goldline handheld salt tester that I personally check for calibration at the store weekly against the Goldline standard solution (The department manager used to do that before I started working there and he has passed the job of meter calibration on to me).

Now the other store in town is a different story. I have had test results that were spot on and ones that were so far in left field it was scary. It seemed to depend on who in the store was doing the testing. I have even asked to see the comparators on the DPD tests so I could see what they were getting when I knew the numbers were off. It all boils down to operator technique. If you want good test results get a good kit and learn to use it!

If you are lucky enough to find a pool store that understands their testing procedures and calibrates their meters if they use them you are probably OK but then again, how can you really know? Just becuase a store uses a large, impressive looking lab setup to test doesn't mean the operator knows what he/she is doing!
Bottom line is water testing is only as good as the person doing it! Just because someone works in a pool store doesn't make them an expert on water testing. I would trust most of the forum members to test my water before I would trust most pool stores. Even the newbies becasue they are getting good info on proper testing techniques and are getting a good education of what is actully happening chemically in their pools!
Just my 2 cents!

[Henrys514]

waterbear, I wish your pool store was close to my house! Shoot, I wish I had that LaMotte setup IN my house!

My husband and I are first time pool owners, and we've been relying on the pool store for everything. Since finding this forum, I've discovered we've been mislead on more than one occasion. I've got the Wal-Mart kit, and plan on getting a FAS-DPD Chlorine kit to suppliment. It's going to be interesting to see how different this summer is when WE have control over the pool.

[mwsmith2]

waterbear, I wish your pool store was close to my house! Shoot, I wish I had that LaMotte setup IN my house!

If you've got Ben's kit, you essentially will!

Michael

[Bleach=Chlorine?]

Too true... I have two pool stores locally and usually go to L's for testing and random stuff but ended up at the other store for a water test. They had some machine and computer that the samples were put into after being injected with reagents. The whole thing looked pretty impressive... until I noticed the kid doing my water workup was fumbling around and looked clueless. Their test results showed a pH of 6.6, TC of .3, TA and CH off the charts and an almost lethal level of copper. The kid started drawing up recommendations when I asked if we could test again. Manager came over and helped this time... all values turned out fine.

[waterbear]

Too true... I have two pool stores locally and usually go to L's for testing and random stuff but ended up at the other store for a water test. They had some machine and computer that the samples were put into after being injected with reagents. The whole thing looked pretty impressive... until I noticed the kid doing my water workup was fumbling around and looked clueless. Their test results showed a pH of 6.6, TC of .3, TA and CH off the charts and an almost lethal level of copper. The kid started drawing up recommendations when I asked if we could test again. Manager came over and helped this time... all values turned out fine.

Sounds like the LaMotte....Taylor and LaMotte are probably the best out there (Ben's kit is based on Taylor's chemisties, which I personally prefer) but like I said before...it all boils down to who is doing the testing. A cheap Walmart kit in the hands of a good tester will give you excellent results...probably better than the pool stores!

[Henrys514]

If you've got Ben's kit, you essentially will!

Michael

I hope to get it at some point. My husband won't go for it right now..."Why should we get some expensive kit when we already have one that works?" Perhaps when the WalMart kit runs low on reagents....I've heard Ben's kits are hard to get right now anyways.

[larry2338]

It is possible to get by with a Walmart test kit. I've been doing it for the last 15 months. Chlorine and pH results aren't super accurate but close enough. I've had my water tested enough times by several different pool stores so that even with their sometimes screwy results, you can eventually throw out the obvious errors and have a reasonably good idea of your Alk, CYA and Hardness levels. It's then a fairly simple matter of remembering that as long as you are not having to drain or fill a lot of water, your levels will remain in a reasonable range. ie: If you have good reason to believe that your CYA level is ~40 ppm and you haven't added any, you can afford to roll your eyes at the next pool store clerk who tells you it's 80 ppm. I just decided to dispense with pool stores entirely and buy Ben's kit so I know exactly what's what all of the time.