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Thread: What's the recommended TA for a hard fill water pool? Also battling some old scale

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    FirstVallartaPool's Avatar
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    What's the recommended TA for a hard fill water pool? Also battling some old scale

    My numbers are currentlyTc 5
    Fc 4.5
    CC .5
    Ta 40
    Ph 6.8-7.2
    Cya 62
    Ch 500


    Scale build up on this 10 yearold pool is also what I'm dealing with. Not too bad now its just above water line and I got it all off with 220 wet sandpaper.
    A member posted this advice Re scale
    "To avoid it in the future maintain your CSI slightly negative, -0.1 to -0.3. I had issues with scale on the waterline tile a couple of years ago and it hasn't been back since. Enter all your numbers in Poolmath and it will give you a CSI score. Tweak PH, TA and CH to adjust it. If your PH tends to rise then keep your TA lower (60-80) to help slow the rise. "
    Also water quality is almost clear crystal but not 100% I plan on deep cleaning the sand filter and if that doesn't do it then researching here about fading DE to it?
    Thanks again!
    Pool 3800 gaĺlon glass tiled concrete approximately 10 years old/ Puerto Vallarta
    Hayward sand filter S166t.
    Pool Pump Silver10/1115 1hp
    Heat siphon Sx3.25hp
    Hard Municipal Water tf-100 test kit

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    Texas Splash's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    You may be keeping the TA and pH low to compensate for the elevated CH, but you're a bit too low. The CH of 500 will be fine if you keep the TA around 50-60 and pH around 7.5-7.6 or so. No need to drop too low on TA and pH. Just keep an eye on those CSI numbers on the Poolmath Calculator.

    Watch your FC though. It's too low right now. Target FC for a pool with CYA of 60 is about 7, never below 5. 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
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    FirstVallartaPool's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    Ok. Just retested all 7 and here's where at now. Btw We've been getting a fair bit of rain [including last night] as it is the rainy season here.

    Fc 2.5 to 3
    Cc .5
    Ta 45
    Ch 275 to 300
    Cya 80
    Cl 4.5
    Ph 7

    Thanks again as I need all the help I can get. I have 2 more weeks to get this water under control then I have to fly out for a couple of months leaving the basics to my friend.. this is all new to me!
    Pool 3800 gaĺlon glass tiled concrete approximately 10 years old/ Puerto Vallarta
    Hayward sand filter S166t.
    Pool Pump Silver10/1115 1hp
    Heat siphon Sx3.25hp
    Hard Municipal Water tf-100 test kit

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    Mod Squad pooldv's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    Ph is a bit too low, it needs to be between 7.2 and 7.8. Rain will usually raise PH a bit through aeration. As Pat said, aim for TA between 50 and 60. Raise it to 50 with baking soda.

    More here on pool chems, Pool School - Recommended Pool Chemicals
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    Your FC is far too low for your CYA level. Are you chlorinating with dichlor or trichlor? Those both have CYA in them. Your CYA is too high for a non-SWG pool.
    50,000 gallon plaster in-ground salt pool with two 60 sq ft DE filters, two Intellichlor IC60 SWGs, two Intelliflo VS pumps, two Whisperflo pumps, two Pentair 400K BTU NG heaters, PCC2000 in-floor cleaning system...two everything.

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    FirstVallartaPool's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    Im not sure what the chlorine powder is..it is in a large 20kilo tub..the pro pool services here use it so dont know if is di or tri [guessing tri as there has never been any cya conditioner added that I am aware of to pool]..is there any way to test it? Re cya level is 80 so high i need to empty the pool or half , before attempting raising ta with baking soda or anything else? Also forgot to mention a good half cup of acida was added a couple weeks ago to lower ph as the Ph was too high [which has usually been the issue, not too low like now]
    Would you guys help me with specific plan of attack now with these numbers as i really know very little at this point. I'm trying to learn fast. This is obviously not a perfect situation but last option is hiring a pool service that will do basically the same thing. I need to sort out then get a system in place for my friend to manage.
    Very much appreciated as I feel very much overwhelmed right now
    Pool 3800 gaĺlon glass tiled concrete approximately 10 years old/ Puerto Vallarta
    Hayward sand filter S166t.
    Pool Pump Silver10/1115 1hp
    Heat siphon Sx3.25hp
    Hard Municipal Water tf-100 test kit

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    Mod Squad pooldv's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    Do you have access to bleach or liquid chlorine? It would be best to switch to a liquid source for chlorine because it doesn't contain CYA.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    FirstVallartaPool's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    Not really here. Its the industrial powder chlorine unless I lived here full time and could add liquid bleach daily from the supermarket etc. I'm aware the cya component and hoping I can get some help from the forum for a system that's practical. Or else it's back to a pool service that uses the same powdered chlorine. Anyone here that can help as what to do now with these latest results would really be appreciated. SOS!
    Pool 3800 gaĺlon glass tiled concrete approximately 10 years old/ Puerto Vallarta
    Hayward sand filter S166t.
    Pool Pump Silver10/1115 1hp
    Heat siphon Sx3.25hp
    Hard Municipal Water tf-100 test kit

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    Mod Squad pooldv's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    How about this?

    Keep TA between 50 and 60
    Keep PH between 7.2 and 7.8
    Keep FC at target for your CYA, FC/CYA Chart

    Once CYA reaches 80 you should drain 50% of the water to lower CYA to 40.
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    FirstVallartaPool's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    OK thank-you. I will drain half the pool and start again to get to fc 3 to 5 [I assume I do this by adding the tri chlorine powder till I test that number?]
    I understand liquid bleach containers no cya raising conditioners but so far I have not figured how to practically make that work in this location. This pool situation is still a work in progress.
    Pool 3800 gaĺlon glass tiled concrete approximately 10 years old/ Puerto Vallarta
    Hayward sand filter S166t.
    Pool Pump Silver10/1115 1hp
    Heat siphon Sx3.25hp
    Hard Municipal Water tf-100 test kit

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    Mod Squad pooldv's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    You can use PoolMath to calculate how much trichlor to add to get your FC TO 5 ppm. There is a link at the top of each page. Here is how to use it, Pool School - PoolMath
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    FirstVallartaPool's Avatar
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    Re: What's the recommended TA for a hard fill water pool? Also battling some old scal

    Ok many thanks to you and everyone as I really feel like a newbie out of water. Im draing half now as we speak. Luckily it is a small pool.

    OK just did cya test now after draining half the pool 38-40 yay! Doing rest of tests now waiting for chlorine to dissolve ..
    OK new results in...any insight as to what to do next? Water is not super clear like it has been last year but not terrible.
    Ph 7.2
    Ch 175
    Fc 9.5
    CC .5
    Tc 10
    Cya 38-40 yay
    Pool 3800 gaĺlon glass tiled concrete approximately 10 years old/ Puerto Vallarta
    Hayward sand filter S166t.
    Pool Pump Silver10/1115 1hp
    Heat siphon Sx3.25hp
    Hard Municipal Water tf-100 test kit

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