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Thread: Urgh! Subjectivity in testing causing me probs!

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    lka674's Avatar
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    Urgh! Subjectivity in testing causing me probs!

    Hi there...new to forum and have already received a ton of advice.

    I ordered the TF100 and haven't received it yet and it will be a week or better till I get it, in the meantime I am having to rely on using a Taylor Total Poolcare DPD kit that only shows me TC up to 5ppm and some Aquachek chlorine pro strips. While I know the strips are not very reliable, for the most part they are reflecting very close to what I get with the DPD and since it's all I have right now......I've gotta punt.

    We live in TX, we built the pool 2 years ago and it gets 100% full sun all day long....in stretches of significantly hot weather (which we get often in the summer) our pool can easily get up to 93-94 degrees and even aerating doesn't help much. Luckily we've been in the low 90's for awhile and the current temp is 87.

    Yesterday when I tested I got the following results:
    FC 3
    TC 3
    pH 7.6
    TA 120
    CH 400
    CYA 80

    I can't dilute right now due to water restrictions, so CYA and CH we have to manage and try to slowly bring it down through backwash, splash out and rain for the moment, so the decision was made to use the FC/CYA chart and adjust appropriately. Our pool looked slightly murky so I decide to use the higher range FC to try to clear it up. I increased FC to around 9ish and reduced the TA down to 100 by lowering the pH to about 7.1 and started aerating. I did this last evening and tested about an hour later and it was within the ranges we needed and the pool clarity was starting to look better.

    I tested this am and got the following results:
    FC 5ish
    TC 5ish
    pH 7.3
    TA 90
    CH 400
    CYA 70???

    Wasn't sure why the CYA was lower...we did have a pretty strong thunder storm and got about 30 minutes of really hard rain dumped into it....but that couldn't explain it totally. So, using the CYA/FC chart I decided to adjust accordingly and again error on high side b/c the pool was murky again.

    Using the pool calculator I added the suggested amounts of chlorine to bring FC up and muriatic acid to again bring the TA down just a bit.

    I went onto the forum and read up about testing and subjectivity a little while ago and can say that yesterday I likely was over shooting the CYA based upon when I thought the dot was gone. So if that was the case, I've basically been dumping chlorine when it wasn't truly needed.

    Regardless, I just went and retested and I'm thoroughly confused what, if anything, I should do!

    FC 9ish
    TC 9ish
    pH 7.2
    TA 100
    CYA 45 (not sure if I should use 40 or 50 here....but this confirms to me that I wasn't testing CYA accurately yesterday)

    My thoughts are to just leave the chlorine alone and let it come down on it's own (are we still safe to swim while this is happening if so?)....but the pH barely budged and I was targeting 7.1 and the TA rather than going down, went UP and that test isn't subjective......

    The pool clarity looks awesome, I don't smell any chloramines....

    Any comments or suggestions would be much appreciated!

    Thanks in advance-
    Laura
    Pool grand opening Sept 2010. 100% sun exposure. Beach entry with fountain, IG gunite pool, approx 11,000g. Hayward HK sand filter. Intelliflow VS 350 pump w/ max flow rate 160 gpm. Dolphin (cordless) M5 Liberty pool cleaner. The pool has waterfall at one end with a tanning ledge and a spa at the other end that has a spillway into the pool and there is a water shear falling from the pool equip wall into the spa. DH did a beautiful job of designing it himself!

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    duraleigh's Avatar
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    Re: Urgh! Subjectivity in testing causing me probs!

    I ordered the TF100 and haven't received it yet and it will be a week or better till I get it
    Nope. If you ordered it this weekend it will ship Monday and Texas is three day delivery (ground) so you will have it on Thursday.

    I do not know why you are adjusting pH and TA...Leave them alone....they are fine and were fine.

    Let your FC come on down to around 5ppm and then keep it there.

    Perfectly safe to swim in FC up to shock value which would be around 20ppm so go swimming!

    The CYA test is hard to get deadly accurate...plus or minus 10ppm is certainly close enough.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Clearwater, FL.
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    Re: Urgh! Subjectivity in testing causing me probs!

    Have fun!
    Keep up the high end of your chlorine and you'll be good until you get your kit and then do a full set of tests and come and post them here in this post.
    all this pool talk...I gotta go get in the pool! I'm suffering from POOLSPARKLEYITIS!

    Chuck
    Swim n Play 21' round, expandable 72" liner, 6FT deep center, buried 14", 12,750 Gallons
    Waterway 1HP-2 speed with 22" Sand filter
    TF-100 test kit
    Thanks to TFP my pool is perfect all the time :party:
    I now suffer from Sparklypoolitis! :whoot:
    I am a Platinum contributor because I want everyone who comes here to Trouble Free Pool to have the same success that I enjoy with my pool and family.

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    lka674's Avatar
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    Re: Urgh! Subjectivity in testing causing me probs!

    LOL! Thanks ya'll...my two year old baby girl is clapping in excitement and searching for her life jacket as we speak!

    Will get back to you once I get the kit and the fun speedstir!
    Pool grand opening Sept 2010. 100% sun exposure. Beach entry with fountain, IG gunite pool, approx 11,000g. Hayward HK sand filter. Intelliflow VS 350 pump w/ max flow rate 160 gpm. Dolphin (cordless) M5 Liberty pool cleaner. The pool has waterfall at one end with a tanning ledge and a spa at the other end that has a spillway into the pool and there is a water shear falling from the pool equip wall into the spa. DH did a beautiful job of designing it himself!

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    lka674's Avatar
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    Re: Urgh! Subjectivity in testing causing me probs!

    Quote Originally Posted by duraleigh
    I ordered the TF100 and haven't received it yet and it will be a week or better till I get it
    Nope. If you ordered it this weekend it will ship Monday and Texas is three day delivery (ground) so you will have it on Thursday.
    Thanks and I actually ordered it yesterday, but may have been too late in the day. Can't wait to get it!!

    I did just let my daughter get in it and then she had to get out for a quick potty break and I DOOOO smell chloramines after all! On her life jacket and her skin.....you think since the chemistry I am getting is somewhat within normal ranges (albeit on not so great test kits), that I can put off any sorta shock process until I can actually read the CC's on Thursday or does that smell mean unsanitary and not safe for my 2 year old to be in? Eeesh! A LOT to learn in a short period of time! LOL
    Pool grand opening Sept 2010. 100% sun exposure. Beach entry with fountain, IG gunite pool, approx 11,000g. Hayward HK sand filter. Intelliflow VS 350 pump w/ max flow rate 160 gpm. Dolphin (cordless) M5 Liberty pool cleaner. The pool has waterfall at one end with a tanning ledge and a spa at the other end that has a spillway into the pool and there is a water shear falling from the pool equip wall into the spa. DH did a beautiful job of designing it himself!

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    lka674's Avatar
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    Re: Urgh! Subjectivity in testing causing me probs!

    And just to mention....I am still getting a small amount of what appears to be soap bubbles forming when the waterfall water and spa spill way hit the pool...I noticed it when we first turned off our tablet chlorinator and switched to liquid. I had asked whether that was normal with bleach and someone, one of the moderators I believe, suggested that it may be indicative of algae.........factoring that into what I just said......does it change any answer?
    Pool grand opening Sept 2010. 100% sun exposure. Beach entry with fountain, IG gunite pool, approx 11,000g. Hayward HK sand filter. Intelliflow VS 350 pump w/ max flow rate 160 gpm. Dolphin (cordless) M5 Liberty pool cleaner. The pool has waterfall at one end with a tanning ledge and a spa at the other end that has a spillway into the pool and there is a water shear falling from the pool equip wall into the spa. DH did a beautiful job of designing it himself!

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