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Hello, To mas85 : did you measure pH as well as Cl and CyA ?

Thank you very much JoyfulNoise for this paper. I already had a copy of it and found it most interesting especially for what concerns disinfection by UV-C (It mainly deals with 254 nm UV when sunlight UV reaching earth have a wave length over ~ 280 nm). However there are some considerations...

Thank you very much for all this information. Re-readng the reports concerning CyA and OCl photolysis to which I have access, the best (?) data I have been able to find are those from Nelson (Monsanto report 6862) and Canelli (1974) which have been reproduced and used under graphical format by...

Hello, Still interested in the theory and consequences of chlorine protection from UV by CyA, I'm looking for data published in scientific or technical papers relating to measurements concerning this protection. I have seen, here and there, mentions of such papers as well as curves "based" on...

do you have biofilm i,n the plumbing ? How can one detect this ? will plumbing develop biofilm if HOCl is high enough ?

Hello Thank you for your answers which helped me understand the subject a bit better. These answers, however, raise a few other questions to me : 1 - You say that 0.05 ppm of HClO is enough to control pathogen and algae an overdosing of chlorine would make the water harsh to eyes, skin, and...

Hello, Thank you for your answers which helped me understand the situation a bit better. These answers, however, raise a few other questions to me : 1 - you s

Hello, There must certainly be a few (many ?) places here where this is discussed in depth. Could you please show me the way to the most relevant ones ? Thank you in advance. Nota : pool in France, pH and chlorine controlled via peristaltic pumps, pH and ORP probes, sulfuric acid (PVC liner)...

Hello, This test confirms, at least to myself, that alkalinity measured via my photometer is coherent with the classical drop count test. I will try to make a similar test with much more stab in the water so as to have a higher contribution for Cya Alkalinity. Thank you again for your...

I compared results of total alkalinity tests made with : a) my Lovibond 620 and alkalinity-m tablets and b) a Hanna total HI3811 alkalinity kit with drops of acid and bromophenol blue as indicator. Both give coherent results with or without ~ 20 ppm Cya in pool water. These tests were performed...

OK with you regarding the poor quality of test strips measurements. No doubts that a test made with drops is the best one. My photometer is a Lovibond 620 and I think that one can trust the measures made with it; the question is just "does it takes CyA alkalinity into account" ? May be the best...

Hello, Thank you for your answers. I know how to get Carbonate alkalinity from TA in the presence of CyA by using the pH dependent correction factor or via pool math app. As I'm using a photometer, I would like to know if the value for TA obtained with it is the same as the one obtained with...

Hello, A question regarding the correction factor to be applied at Total Alkalinity measurement in order to get Carbonate Alkalinity : does this correction factor applies whatever the measurement type for TA ? Said otherwise, do we get (approximately) the same results for TA whether we use a...

I'm just discovering the existence of bipolar electrodes ad will try to dig a bit more into the subject. Thank you very much JamesW.

I'm just discovering the existence of bipolar electrodes ad will try to dig a bit more into the subject. Thank you very much JamesW.

I'm just discovering the existence of bipolar electrodes ad will try to dig a bit more into the subject. Thank you very much JamesW.

To JamesW : I would very much like if you could link to any paper describing such a process as it is still difficult for me to understand how an anode can simultaneously be a cathode. This being said, I do very much appreciate your teaching efforts. Thanks a lot.

For SoDel, here below an extract of "White's handbook of chlorination..", page 9 : ====================================================================== The overall chemical reaction in a diaphragm cell is NaCl + H 2 O + Electric current → NaOH + Cl 2 + H 2 . (1.3) The...

Hello, Checking the specs of T15 cell, it is supposed to deliver 30 g/h of chlorine which means that the current flowing through the cell should be at least 30/1.3 =~ 23 A. I didn't find any indication re nominal values for current and voltage of the cell but the values of 23.45 V and 6,47 A as...

Oups ! I inadvertendly sent part of a draft version of my post...Here-below the full post.. Hello, The following is the the way I see it : - electrolysis of NaCl occurs at concentrations high enough not to go into water electrolysis; - whatever the shape, the number and the connecting...

Hello, The way I see it is the following : Whatever the shape, the number and the connection system of the plates, there is (theoretical maximum) one mole of Cl- produced for each mole of e- passing through the cell. One mole of e- corresponds to a charge of ~ 96500 Coulombs and one mole of Cl-...

Hello, If I'm not wrong, an SWCG should produce about 1.3 g/h of chlorine per Amp. through the cell. When reading specifications in user's manuals, they claim it is about three times more... I surely missed something. Can you tell me what ? Thanks in advance

Hello again, Thank you very much for your answer.

Hello from France, First of all, let me apologize in advance for my poor english and certainly for my poor knowledge of chemistry. This being said, it looks to me as if no reason was found, acceptable by (almost) everybody, that could explain why some people experiment a pH rise in SWG pools...