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Thread: Newbie with TF-100 results and pics

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    Newbie with TF-100 results and pics

    We moved into a house this winter that had a pool but the cover was on it. I finally took the cover off today since I got my TF-100 kit in the mail so I could do some initial testing. Results are below. I also turned the pump on for the first time without the freeze switch turning it on itself. Before turning on the pump, I cleaned both of the skimmers and the filter that's before the pump.

    I've read through most of the Pool School stuff, so I plan on SLAMing it this week. Before I do that I need to get the pH down to a normal level. I also think I need to add some water since it only comes up about half way to the skimmer doors, which hinge at the bottom, meaning no water is flowing into the skimmers due to the level. Any issues with adding water now? Also, what is a good initial pump schedule? My Polaris vacuum is at the bottom of the pool (out of sight) and not hooked up. Do I need to hook this up now? Sorry for all of the n00b questions, just trying to learn as much as possible.

    pH: > 8.2 (off the chart)
    FC: 0
    CC: 0
    TC: 0
    TA: 40
    Calcium: >750 (stopped testing at 30 drops)
    CYA: <20 (never lost sight of the black dot)
    Pump PSI: 23


    23,000 gal, in-ground, plaster with 24" sand filter, 1.5" piping.

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    Re: Newbie with TF-100 results and pics

    Yes, definitely get the pH down. However, with the low TA, it won't take much acid to drop it. Once the pH is down, recheck the TA and bring it back to about 60. I would suspect testing error on the calcium hardness test.

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    Re: Newbie with TF-100 results and pics

    Quote Originally Posted by JamesW View Post
    Yes, definitely get the pH down. However, with the low TA, it won't take much acid to drop it. Once the pH is down, recheck the TA and bring it back to about 60. I would suspect testing error on the calcium hardness test.
    Thanks for the response.

    Pool Math is recommending me to add 20oz of 31.45% MA. Are you saying it won't take as much since the TA is so low? Also, any tips to adding the MA? This is the one chemical the previous owner left me so I plan on doing it tonight.
    23,000 gal, in-ground, plaster with 24" sand filter, 1.5" piping.

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    Richard320's Avatar
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    Re: Newbie with TF-100 results and pics

    Quote Originally Posted by tangouniform View Post
    Thanks for the response.

    Pool Math is recommending me to add 20oz of 31.45% MA. Are you saying it won't take as much since the TA is so low? Also, any tips to adding the MA? This is the one chemical the previous owner left me so I plan on doing it tonight.
    If you enetered all your readings, the acid dosage will be calculated factoring in the TA value. Just be aware that if pH reads 8.2, it may well be higher, and could take another dosing to actually bring it into range.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Newbie with TF-100 results and pics

    Poolmath will be close as long as you entered correct values for pool volume, pH, TA and Borates.

    TA and Borates act as a pH "buffer." Having those at higher levels would require you to add more acid for the same desired change in pH. It is however unlikely that you have Borates.
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

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    Re: Newbie with TF-100 results and pics

    Thanks guys.

    Yes, I entered in all of the current values on PoolMath and it told me 20oz of MA. I just got done adding it in front of one of the returns. It took me about 5 minutes to add it, since I read it must be done slow to not damage the plaster. The pump has been running for about 3 hours now so I'll give it another hour then call it a day. What do you guys think about the water level? If it's not going over the skimmer gate as of now, it's obviously too low, correct? Is now a good time to add?
    23,000 gal, in-ground, plaster with 24" sand filter, 1.5" piping.

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    Smykowski's Avatar
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    Re: Newbie with TF-100 results and pics

    The flapping action of the weir door is what helps create the skimming. As long as the pump isn't sucking air from the skimmer box, your water lever is fine.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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    Re: Newbie with TF-100 results and pics

    You also asked about pump run time, until you get it clear, you will want to run it as much as possible (you will want to be around to back wash often in the initial stages of cleaning up)

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: Newbie with TF-100 results and pics

    Quote Originally Posted by Isaac-1 View Post
    You also asked about pump run time, until you get it clear, you will want to run it as much as possible (you will want to be around to back wash often in the initial stages of cleaning up)

    Ike
    So is it cool to leave it running over night or should I just shut it off before bed and turn it back on tomorrow morning? I'll read up on back washing right now.
    23,000 gal, in-ground, plaster with 24" sand filter, 1.5" piping.

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    Re: Newbie with TF-100 results and pics

    If you're reasonably sure it won't clog up to the point where flow decreases to zero, run it.

    If, on the other hand, the filter is clogging up within a few hours, you don't want to run it all night.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Newbie with TF-100 results and pics

    Quote Originally Posted by Smykowski View Post
    If you're reasonably sure it won't clog up to the point where flow decreases to zero, run it.

    If, on the other hand, the filter is clogging up within a few hours, you don't want to run it all night.
    Well, I can't see the bottom of the pool so I have no idea what kind of trash is down there. That alone makes me hesitant to run it all night.
    23,000 gal, in-ground, plaster with 24" sand filter, 1.5" piping.

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    Re: Newbie with TF-100 results and pics

    The SLAM process is a multi day affair when dealing with swamp conditions, the first day or two and you will likely be backwashing the filter every few hours, as things clear the time between the need to backwash will increase, once you get down to the once to twice per day point, then you can backwash before going to bed, and check it in the morning.

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    Re: Newbie with TF-100 results and pics

    Quote Originally Posted by Isaac-1 View Post
    The SLAM process is a multi day affair when dealing with swamp conditions, the first day or two and you will likely be backwashing the filter every few hours, as things clear the time between the need to backwash will increase, once you get down to the once to twice per day point, then you can backwash before going to bed, and check it in the morning.

    Ike
    How will I know when to backwash? I read the backwash "How To" but it never stated when to do it.

    Also, I read about adding DE to a sand filter. Would it be pointless to do now or would it benefit me now to help clear the water?
    23,000 gal, in-ground, plaster with 24" sand filter, 1.5" piping.

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    Re: Newbie with TF-100 results and pics

    Quote Originally Posted by tangouniform View Post
    How will I know when to backwash? I read the backwash "How To" but it never stated when to do it.

    Also, I read about adding DE to a sand filter. Would it be pointless to do now or would it benefit me now to help clear the water?
    Watch the PSI on the filter gauge. when it increases by say EDITED20-25% of it's clean value, backwash. I'd wait to add the DE. It's more of a finishing polish (in theory) and you'll just backwash it out at this point. Some people wait longer on the backwashing...
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
    Size: 12'-21'x39' free form, depth ranging from 4' to 7, attached 6 person spa with spillover.
    Equipment: Whisperflo 2hp pump, Pentair 30" sand filter, Pentair Mastertemp 400k BTU heater, 1hp Whisperflo for waterfalls, and a blower for spa floor

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    Re: Newbie with TF-100 results and pics

    A 10-15% rise is a little lower than we recommend. I would wait for 20-25% rise. Sand filters seem to filter a little better when they're a little bit dirty. If you backwash too often, you lose this benefit, plus it's more work (and water dumped overboard) than necessary.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Newbie with TF-100 results and pics

    Quote Originally Posted by Smykowski View Post
    A 10-15% rise is a little lower than we recommend. I would wait for 20-25% rise. Sand filters seem to filter a little better when they're a little bit dirty. If you backwash too often, you lose this benefit, plus it's more work (and water dumped overboard) than necessary.
    You're right, I had the wrong % in my head. My bad. Edit ninja here I come.
    IG gunite/plaster pool/spa Started 1/17/14, Plastered 5/16/14
    Size: 12'-21'x39' free form, depth ranging from 4' to 7, attached 6 person spa with spillover.
    Equipment: Whisperflo 2hp pump, Pentair 30" sand filter, Pentair Mastertemp 400k BTU heater, 1hp Whisperflo for waterfalls, and a blower for spa floor

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    Re: Newbie with TF-100 results and pics

    tangouniform might not know the normal pump pressure since they moved in during the winter. Can you post another PH result now that you have added the MA?
    Gerry
    27' x 54" AG Salt Water Pool Installed 2014, Hayward 23" Sand Filter, 1 HP 2-Speed Power-Flo Matrix Pump, AQ-TROL SWG, TF-100 Test Kit

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    Re: Newbie with TF-100 results and pics

    Thanks guys. I did read about the pressure increase but considering this is the first time I've turned on my pump and noted the pressure, I'm not sure if this is the "dirty" pressure or clean. Should I go ahead and backwash to start and go from there? I've run my pump now for 5 hours and had no pressure increase.

    - - - Updated - - -

    Quote Originally Posted by gwc View Post
    tangouniform might not know the normal pump pressure since they moved in during the winter. Can you post another PH result now that you have added the MA?
    I posted my reply at the same time as yours. I will get another pH reading during lunch.
    23,000 gal, in-ground, plaster with 24" sand filter, 1.5" piping.

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    Re: Newbie with TF-100 results and pics

    That's an ok plan. Do you know for sure that your gauge is working correctly? Does the pressure go to 0 with the pump off?
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Newbie with TF-100 results and pics

    Quote Originally Posted by Smykowski View Post
    That's an ok plan. Do you know for sure that your gauge is working correctly? Does the pressure go to 0 with the pump off?
    It does read 0 when off.
    23,000 gal, in-ground, plaster with 24" sand filter, 1.5" piping.

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