Is there a normal amount of chlorine burn off between uses? For example assuming a CYA of 30, let's say you have a starting FC of 6...the next day with no bathers should the FC still be at 6ppm and if it's lower is that indicative of a problem?
Is there a normal amount of chlorine burn off between uses? For example assuming a CYA of 30, let's say you have a starting FC of 6...the next day with no bathers should the FC still be at 6ppm and if it's lower is that indicative of a problem?
It is for my hot tub. It also has a cover over it except when in use so I assume not much sun burn off. I think I've got something else going on cc was 1ppm.Hi Daveooph,
UV from the sun will burn off some chlorine each day. How much FC loss there is to UV depends on where you are. and what your CYA level is and how much shade the pool might get. With a 30 CYA in Dallas with predominantly direct sun on the pool, I would suspect you would loose at least 3 ppm daily. Maybe even 4 in Mid August. I say this based on personal observations of my own pool.
I'm 120 miles east of you, and I loose about 3 a day due to UV in July and August with my CYA level at 70 (I have a swg so I keep higher CYA). Less loss at cooler times of year.
The indicators of a problem with the water, are high Combined Chlorine level (aka chloramines) of greater than .5, and / or water that just looks sort of dull.
Either of these indicators should prompt you to do a full set of tests plus an Overnight Chlorine Loss Test to see if there are organics (algae), causing teh CCs or dull water.
EDIT:
Dave, just for clarification. Is your question about a hot tub or spa or a pool? The reason I ask is because I just noticed your question is posted in the Hot Tub and Spa forum.
Just got the tub about 2 weeks ago. CYA is around 30. I ststertdd with granular chlorine and once CYA was built up I moved over to bleach.How long has it been since you changed over the water?
How are you chlorinating the spa?
Do you have CYA in the tub? What level is it at?
You could SLAM the tub but it might be less expensive to just do a water change. If you do drain the tub and have never done so, I would recommend using a surfactant product to flush the plumbing of biofilms. Ahh-some is the best product around for performing a deep clean of the spa plumbing. Amazon.com : Ahh-Some Hot Tub/Jetted Bath Plumbing Jet Cleaner (2 oz) : Bathroom Cleaners : Office Products
It is for my hot tub. It also has a cover over it except when in use so I assume not much sun burn off. I think I've got something else going on cc was 1ppm.
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Checked this morning and was at 4.5FC. Remember yestersy evening I shocked to 16 and it went down to 9 before I went to bed. I want to keep the water if possible because my fill water has a TA of over 350 and it took a lot of time and acid to get everything balanced. I'll flush with ahhsome and drain if needed though. What do you think based on this mornings FC numbers?So maybe you got behind in dosing. The 24-hour loss rate should be measured after you've dosed sufficiently for your prior soaks so that there is not a lot of residual chlorine demand left. If you did this right, then it looks like you may have biofilm or something else consuming a lot of chlorine. A new spa has a lot of greases, oils, and sometimes biofilm from wet testing. I suggest you get Ahh-Some that JVTrain suggested and use it and then change your water.