I have another question for you all i have been testing the T/A and CYA and CH once a month which seems to be fine they are pretty steady untill the last 6/8 weeks we have had some really heavy rain upto 10cm in one go.so ive had a fair bit of run off had to open the overflow several times . Anyways ive brought the CYA back up but the CH has dropped down to 150 from 260 would this have any effect on measuring T/A as i am not getting the clear colour change i used to get it goes to a dark pink colour and not the obvious red it used to the tablets have been kept dry and out of sunlight .Could the CH dropping down that much have any effect on the TA test
i use Palintest kit.The PH is rock solid it dropped a bit as i used some spare trichlor to bring the CYA back up to 75 the ph moved from 7.7 to 7.5 over 2 weeks and now its been there for 2 weeks without moving at all i dont have any PH drift problems the pool is crystal clear i have not had any algae cloudy water prolem since is started using the method here about 12 months ago.I might have to raise the CH with CAL-HYPO slowly over time as chemicals here where i live are not easy to get hold of.
"palintest Total Alkalinity Test Tablets in a 250 tablet bottle - Total Alkalinity in a range of 0 - 500mg/l
Total Alkalinity - 250 Tablets - Add one tablet to sample in a stoppered container. Shake to disintegrate tablet. Repeat until yellow colour changes to bright red.
Total Alkalinity can then be calculated as:
50ml sample container = number of tablets added multiplied by 40 then minus 20 to give you your Total Alkalinity reading. i.e. 6 tablets added, so (6 x 40) - 20 = 220 mg/l
100ml sample container = number of tablets added multiplied by 20 then minus 10 to give you your Total Alkalinity reading. i.e. 11 tablets added, so (11 x 20) - 10 = 210 mg/l "
TA goes dark pink at 70 and does not change even upto 10 tablets ( on 50ml sample)