high FC low CC

[hkcon]

hi guys, here are my test results FC 66 ppm, CC 0 ppm, PH 8.0, TA 90 ppm, CYA 0... 26,000 gals. water clear and bright I live in northern ca. and I do not plan to winterize as we use the hot tub (connected) all winter. this is my first test with a k-2006 so results may be newbie "tainted"...I know I need some muriatic and stabilizer and that my CC is obviously low ( I have been adding 1 gal. of 12.5 liquid chlorine everyother day) so I am looking for order of adding ingredients...ty for the help I know you guys are going to hit me with....

[Watermom]

Do you really have a FC reading of 66ppm? Don't add any more chlorine for now. Explain how you tested. Also, tell us what kind of pool you have --- vinyl, concrete, fiberglass, etc.

Your pH reading of 8.0 cannot be trusted when you have high chlorine. So, do not add any muriatic acid at this time.

Is this a freshly filled pool? Is liquid chlorine the only source of chlorine you have used? Just trying to understand why you have no CYA.

Also, you do NOT want a CC reading. So, CC of 0 is perfect!

[hkcon]

Do you really have a FC reading of 66ppm? Don't add any more chlorine for now. Explain how you tested. Also, tell us what kind of pool you have --- vinyl, concrete, fiberglass, etc.

Your pH reading of 8.0 cannot be trusted when you have high chlorine. So, do not add any muriatic acid at this time.

Is this a freshly filled pool? Is liquid chlorine the only source of chlorine you have used? Just trying to understand why you have no CYA.

Also, you do NOT want a CC reading. So, CC of 0 is perfect!

Hi Watermom,
ok things have changed a bit since I was here last. I filled out the form so all my info is there (wherever that is) but to answer you I tested once and had to put in 33 drops before the water went clear with a taylor k-2006a. concrete, not freshly filled (water has been in for at least 5 yrs since I have owned it. Yes I only use liquid chlorine, but I recently switched from 10% to 12.5%. I believe i have no cya because I put in 8 lbs at the opening of the season and nothing since. I have not added anything as I was pretty sure I would do the wrong thing...I await your instructions...

[aylad]

If you put in 33 drops, then your chlorine is actually 16.5 (if you used the 10 mL sample). You divide by 2, instead of multiplying by 2. I would add CYA to around 40-50 ppm, but otherwise your numbers don't look too bad. If it's a concrete pool, then your calcium needs to be 200-400 ppm, but you didn't list that. If it's too low, then the water will leach the calcium out of your concrete finish and make it brittle.

[hkcon]

If you put in 33 drops, then your chlorine is actually 16.5 (if you used the 10 mL sample). You divide by 2, instead of multiplying by 2. I would add CYA to around 40-50 ppm, but otherwise your numbers don't look too bad. If it's a concrete pool, then your calcium needs to be 200-400 ppm, but you didn't list that. If it's too low, then the water will leach the calcium out of your concrete finish and make it brittle.

thank you Aylad, my test kit said to multiply by drop equivalence (0.2 for 25 ml, and 0.5 for 10 ml), and i just realized I am a moron and 33 times .2 equals 6.6 not 66, ok so question now becomes, "how much CYA to get my pool to that 40-50 ppm area"? I have 25 lbs on hand.

[hkcon]

also my ch is 230 so I am ok on that right?

[aylad]

What kind of pool do you have? If it's plaster or concrete, then Ca of 230 is ok but I wouldn't let it get lower than that. If it's a liner pool, then the Ca reallydoesn't matter, as long as it doesn't get high enough to cloud your water. I'm at work right now and don't have access to my chem caculator but when I get home later I'll figure the answer to your CYA question if nobody beats me to it.