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14/05/2008, 20:41 Sharkster Joined on 20/10/2006 Posts 196 Decreasing Total alkalinity I have been using PH- to bring it down, managed to bring it down by 25 yesterday to 175 but it is back to over 200 again today, but the PH is now 7.8 when it was over 8 before.  Should I be using something else to reduce the TA.  I believe the active ingrediant in my PH- is Sodium Bisulphate or something.    Report

14/05/2008, 22:18 Poolguy Joined on 25/12/2004 Charante Maritime Posts 746 Re: Decreasing Total alkalinity I've answerd you on the other thread. Leave your TA alone .. its ok Bring down the pH though 7.2 -7.6, use Dry acid, hydrochloric or sulphuric acid.   Andrew www.Poolguy.fr    Report

18/05/2008, 0:53 Sharkster Joined on 20/10/2006 Posts 196 PH Problems I took a reading this morning and my PH was at 7.3 and TA 183, which I thought was fine.  Went out for the day leaving the cover off the pool and it rained heavily and now my PH read 8 and TA 203.  I have read the PH can be increased by aerating the water and rain does just this.  Is this why my PH has gone up so much?  If so, is it back to more PH- to solve the problem?  I have an above ground pool with a vinyl liner and 11M cubed of water.  I know sulphuric acid is better at reducing the PH but I am not sure it is suitable for a vinyl liner.  My PH has been constantly on the move this week, I get it down with PH- and then it increases again.  Please help!!!!!!!!!!    Report

18/05/2008, 16:06 buckdendave Joined on 05/03/2008 Posts 26 Re: PH Problems The vinyl liner won't care whether its any of those options, as long as whatever you add is properly dispersed and you don't add too much.  The pH- liberates sulphuric acid in any case when it reacts with water, but in my opinion its always better to add hydrochloric acid for reasons that I won't go into.  Just take care not to spill any or breathe the fumes. Are you sure that your pH reading is correct? Dave    Report

18/05/2008, 17:46 Sharkster Joined on 20/10/2006 Posts 196 Re: PH Problems I think so.  I am using a digital pool tester.    Report

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