Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: A Few Questions

  1. Back To Top    #1
    cpeterson70's Avatar
    Join Date
    Sep 2015
    Location
    Carrollton/TX
    Posts
    121

    Question A Few Questions

    Was just thinking about testing pool water and had a few questions:

    What makes algae grow? Is it not keeping CYA/Chlorine balanced?

    Do you do an OCLT every night, once a week, when you feel like it?

    If you fail an OCLT on one night, do you SLAM that day?
    Free form, according to plan - 33' X 17' (3 1/2' - 6' deep) plaster pool (approx 13,700 gallons pool, 700 gallons spa). Chlorinated. Jandy equipment, DE filter, free form elevated spa, 2 skimmers, 5 returns, tanning ledge, 8 ft weeping wall of Oklahoma/Moss boulders (double as retaining wall), Oklahoma flagstone coping. TF-100 kit and speed stirrer. Full sun 9-4:30.

  2. Back To Top    #2
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,981

    Re: A Few Questions

    Algae grows when there is an ideal combination of food (i.e. phosphates), water temperature, and light to support its activity. Pools that are neglected long enough to allow the FC level to drop too low for the current CYA may not have adequate protection to prevent algae. No, we do not perform an OCLT every night, once a week, etc. Only when required to rule-out the need to perform a SLAM or ensure the SLAM is complete. Last time I did an OCLT was about a year ago. If we fail an OCLT, the typical response is to begin a SLAM immediately and continue doing so until al 3 SLAM criteria are passed.
    Pool School - Defeating Algae
    Pool School - SLAM - Shock Level And Maintain

    Hope that helps.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  3. Back To Top    #3
    cpeterson70's Avatar
    Join Date
    Sep 2015
    Location
    Carrollton/TX
    Posts
    121

    Re: A Few Questions

    Thank you.

    What would make you think to do an OCLT if one isn't performed regularly?

    I just finished a SLAM about a week or so ago, so I was just curious what I should be looking for in my testing. I'm new to all of this and I'm a bit paranoid now...don't want to do that again!!
    Free form, according to plan - 33' X 17' (3 1/2' - 6' deep) plaster pool (approx 13,700 gallons pool, 700 gallons spa). Chlorinated. Jandy equipment, DE filter, free form elevated spa, 2 skimmers, 5 returns, tanning ledge, 8 ft weeping wall of Oklahoma/Moss boulders (double as retaining wall), Oklahoma flagstone coping. TF-100 kit and speed stirrer. Full sun 9-4:30.

  4. Back To Top    #4

    TFP Guide

    Jezza's Avatar
    Join Date
    Jan 2015
    Location
    Bunbury, WA, Australia
    Posts
    843

    Re: A Few Questions

    If your battling to hold FC despite regular additions of chlorine and your water looks dull or cloudy-in the absence of any obvious algae.
    11 000 gallons, IG, Fibreglass, Monarch Sand Filter, Davey Typhoon C100M 1HP pump, Davey Chloromatic Mc16CTO ESR SWG, Davey Pool Wall Climba Robot, Daisy Solar Cover,
    K-2006

  5. Back To Top    #5
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,981

    Re: A Few Questions

    ^^ Correct. There's no need to do an OCLT unless you need to rule-out any possibility of algae. If you see any hazy/cloudy water, you may need to do an OCLT. Another example, people often ask if they can raise the CYA a little more for the summer heat. I'll say okay as long as they are absolutely sure they are algae-free so that they know the FC loss is normal (2-4 ppm per day) and not due to excess organics.

    After your SLAM your water should've been very clear, so if it ever changes from that clarity, you may need to do an OCLT.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  6. Back To Top    #6

    Join Date
    Jun 2014
    Location
    Rogers, AR
    Posts
    412

    Re: A Few Questions

    Sunday night I noticed my pool looked off. Everyone said I was crazy it was crystal clear.

    I immediately decided to leave the pump running all night and perform an OCLT. I failed the OCLT, so Monday (a holiday naturally) I kept chlorine at 10 all day so everyone could swim. As soon as the last swimmer was out I brought it up to SLAM and brushed the entire pool at 11:00 at night. I lost 3.5 ppm Monday night. Yesterday I kept at it all day, brushing, testing adding chlorine. By last night I had my sparkle back. I passed my OCLT last night.

    You will learn your pool and what it should look like.

    In my case I know my robot does a crummy job in my deep end and yet I have let brushing go for a couple of weeks and the fertilizer guy came Thursday and I always run the robot after he leaves and I didn't this time. My CYA is 40 and my chlorine never went below 3.5 but I still got something brewing.
    16x32 IG rectangular 21,800k new vinyl liner 2014, Triton II TR 50 sand Filter, Pentair 3/4 hsp whisperflow pump, 3 returns, TF100 test kit w/speedstir. Maytronics s 300i robot.

  7. Back To Top    #7
    cpeterson70's Avatar
    Join Date
    Sep 2015
    Location
    Carrollton/TX
    Posts
    121

    Re: A Few Questions

    Thanks for the replies. Very helpful!
    Free form, according to plan - 33' X 17' (3 1/2' - 6' deep) plaster pool (approx 13,700 gallons pool, 700 gallons spa). Chlorinated. Jandy equipment, DE filter, free form elevated spa, 2 skimmers, 5 returns, tanning ledge, 8 ft weeping wall of Oklahoma/Moss boulders (double as retaining wall), Oklahoma flagstone coping. TF-100 kit and speed stirrer. Full sun 9-4:30.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •