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Thread: Should I have shocked the pool?

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    Should I have shocked the pool?

    I am converted. After reading the forum I have gone to the BBB system. I bought a TF test kit. Last summer I had terrible algae problems and spent beaucoup $ on chemicals as recommended by Leslies.

    A local pool company suggest I perform a water treatment at the beggining of this season. I am pretty sure it was borate as I needed to add a significant amount of acid (I did this before finding this forum).

    On reciept of my test kit I got the following readings

    FC 5
    TC 5
    CC 0
    PH 7.5
    TA 140
    CYA 100+
    CH 450+
    Borates 50
    H2O Temp 80

    No visible algae

    The CYA and the CH bugged me. I slept on it and early the next morning drained 70% of the water and refilled. That night I added the required chlorine and got the following test readings:

    FC 6.5
    TC 6.5
    CC 0
    PH 7.5
    TA 110
    CYA 50
    CH 370
    Borates 30
    H2O Temp 82

    I have since been keeping up with the bleach not allowing the FC to get below 5.5. It is now Tuesday and I have seen a couple of small patches of green algae.

    All that and I still have algae................
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

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    frustratedpoolmom's Avatar
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    Re: Should I have shocked the pool?

    I would test the FC tonight and see if the FC is holding, if you lose more than 1ppm you should begin the shock process tomorrow...
    growing green algae or dusty/dirt/polleny cruddy stuff congregating on the bottom?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Should I have shocked the pool?

    Just green algae on the walls. It brushes off easily. The night before last the FC didn't drop more than 1 ppm.
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

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    Richard320's Avatar
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    Re: Should I have shocked the pool?

    What he said.

    You may still have algae hiding in the filter or behind the light. I don't know what time zone you're in, but it's still before bedtime anywhere in the US, so you'll have time to do the overnight test. Then you'll know, objectively, whether you need to shock or not. That's the beauty of having your own test kit.

    When you tested CYA, did you mix real good? Was it in good light? And did you test, pour back in the bottle, and test again a few times? If your reading is more like 60 or 65 instead of 50, your Chlorine is just below the safe line.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Should I have shocked the pool?

    I'm in Lucas TX. I am heading out right now to test the FC.
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

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    Re: Should I have shocked the pool?

    It's great having your own test kit. FC 5, interesting the Taylor basic kit looks more like 3 rather than 5.
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

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    Re: Should I have shocked the pool?

    The CYA could be more like 60, it depends on how long the solution sits in the viewing tube.
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

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    Mod Squad Bama Rambler's Avatar
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    Re: Should I have shocked the pool?

    How long do you run the pump each day?
    You may have bad circulation in some places and therefore are seeing lower FC in spots.
    Try testing the water by taking a sample before the pump runs close to where you're seeing the green. (we normally don't recommend this I'm just trying to see if that's the problem)
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Should I have shocked the pool?

    I took a sample this morning before the pump started to run and got FC = 5.5, maybe I was not so accurate the night before. I rechecked the CYA, I am pretty sure it is 50. No signs of algae this morning, I will check again this evening. I added enough chlorine to achieve FC = 7.5.

    I run the pump 7 hours per day, once in the morning 8 - 11:30 and then 4 - 7:30. You may be correct about the dead spots, there is not a jet close to the main algae areas.
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

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    frustratedpoolmom's Avatar
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    Re: Should I have shocked the pool?

    Well, that could be part of the problem then - I'd just concentrate on brushing those problem areas once a day for a while and see if the problem reoccurs...keep an eye on the chlorine demand, an excessive overnight drop could indicate you should still shock.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    Re: Should I have shocked the pool?

    UPDATE - No algae the next day,
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

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    Re: Should I have shocked the pool?

    UPDATE:

    The algae is back! There are very small patches on the walls that brush off easily.

    I have been very diligent about testing and keeping up with the pH and free chlorine level. I have not allowed the FC to fall below 5.5. I have rechecked the CYA and still come up with 50ppm. The pool temp is now about 90F, its getting very warm here. I have added water as required to keep the level up but not a significant volume.

    I brushed the walls at the weekend, its Wednesday and I already have signs of algae. I am thinking of adding borate to see if it will help.

    Any ideas
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

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    frustratedpoolmom's Avatar
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    Re: Should I have shocked the pool?

    Borates would probably be a good idea... go ahead and shock the pool and then run with a slightly higher FC level for a couple of weeks. Check any areas where it can hide like light niches, ladders, etc.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  14. Back To Top    #14

    Join Date
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    Re: Should I have shocked the pool?

    You could also have a circulation problem. Next time you check your chlorine, test it at its lowest before you add more chlorine to the water and get your sample near where the algae is forming on the wall. If the FC level is very low there but seems more normal in other areas where there is no algae, then you might look at the circulation pattern in your pool such as the direction the returns are pointed and your pump run time and when it is run.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Should I have shocked the pool?

    Should the jets be pointed in such a direction to form a clockwise or anti clockwise circulation?
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

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    Mod Squad Bama Rambler's Avatar
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    Re: Should I have shocked the pool?

    Whichever way gets you the best most complete circulation. In fact you may wind up with some pointed one direction and some pointed another, depending on what works best for your pool.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Should I have shocked the pool?

    UPDATE: Last saturday I decided to add the borate. Fifteen cartons of 20 Mule Borax was a lot of borax. I had to go to 2 Targets and empty both stores shelves. Saturday morning went well only the odd question from my wife "what are you doing out there?" I ended up not shocking the pool. The result was amazing. I had two parties for kids last weekend. Even after 2 parties the water was crystal clear after a bit of filtering and after a week of very hot temperatures here not a trace of algae. GO BORATES!!

    Thanks BBB. I have converted a guy here in my office, he is convinced. One of the other guys here says its too much trouble and threw another tablet in. Each to his own.
    In ground Plaster pool 33,000 gal, DE filter, 2.5 HP pump, spa
    TF100 test kit
    Lucas, TX

  18. Back To Top    #18
    frustratedpoolmom's Avatar
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    Re: Should I have shocked the pool?

    Excellent update... hey, check your PMs (upper left corner)
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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