Recent content by CFB

JoyfulNoise, thanks. Will keep monitoring the TA with time as well as any acid consumption and amount of fill water. We have had very little rain over the last 3 months. We do not get snow here, so no ice melt.

Interesting re calculations. I have a SWG for chlorine generation - no other chemicals added. In fact I find I only need to add bicarbonate. I checked my Poolmath app logs and can confirm only bicarbonate addition of around 2 kg per month to get TA around 90 from around 70. Acid has been at a...

Thanks! TA of fill water is about 20 and pH around 7.6. Can understand the low TA of fill water would be a contributing factor but evaporation and hence tap filling has been minimal, I would say only a few percent of the entire volume of water over the month. Virtually no acid consumption over...

JoyfulNoise, A quick question: the alkalinity of my pool drops from around 90 to 70 over 4 weeks, over which time no noticeable amount of acid is consumed. Can this be explained by outgassing of CO2? All other parameters are very stable. Pool chemistry: pH 7.8 Cl 5.0 CH 250 CYA 45 ALK 90 down...

PoolMath by TFP

Thank you JoyfulNoise. I have noticed that the APP to calculate CSI gives the same values regardless of whether I select C or F for temp. I think the C values are correct. Any idea?

I have been looking at the FC=7.5% CYA rule. If we take 30 ppm and 50 ppm CYA we get 2.25 ppm FC and 3.75 ppm. I understand these are minimum levels. But other posts suggest that HOCl = 0.05 ppm is what is required to prevent algae formation. This corresponds, from various posts and articles...

Again, very helpful, thanks. So, just a couple of things: 1. Why is CYA of 60 not recommended for a SWG pool? 2. In Pool School it also notes that there are advantages to running the SWG during the day when sun is shining on the pool. Do you know the advantages? I cannot seem to find them.

Great, thank you-that is very clear. Regarding ORP, my pool sits at around 500 mV with all else stable and a CSI of close to zero. Yes, I realize ORP is a moving target and depends on many variables, and trying to get it above 650 mV would require altering pool conditions (eg, lower pH, higher...

Thanks JoyfulNoise. Would you know why the recommended level for CH for a pool with SWG is 350-450 ppm or so, which is about 100 ppm higher than a pool with no SWG? (Numbers from Pool School) Also, CYA recommended levels are 70-80 approx. but I have an ORP meter which is not so helpful as a...

Thank you JoyfulNoise. I have now crunched the numbers and all is clear. The link was helpful! My other question is on ORP. It is related to CSI, in that for a CSI near zero my ORP is low. Here goes...to stop pH rise and to balance the CSI I maintain my pH at 7.8. However, the ORP at 7.8 is...

Thanks-I now have the full app and it gives temp in degrees C so yes, -0.5 on Poolmath app.

I am new to the forum and enjoy reading the useful information. I mostly keep (or at least try to!) my pool water within the ranges given on the forum. My pool is SWG, values are (from Taylor's Kit): pH 7.6 CH 230 ALK (total) 70 CYA 45 [I keep this less than 50 ppm because I have an ORP probe]...