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Old 14-01-2007, 08:18   #1
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PH balance, alcaline and acidic cleaners

Hi everyone, I was wondering if anyone can shed some light on cleaning mixtures for membranes. mine are filmtek SW30-2540.
The literature says PH12 for alkaline cleaning. What percentage of TSP in water gives this PH. Also PH of 2 for acidic cleaning (muratic or Hydrocloric acid are fine). What mixutre of solution gives these PH balances? Where does one get a PH meter? I think for now I will not do acidic cleaning as it is dangerous in reacting with biological life on the membrane. So just the alkaline. We stayed at and anchorage for too long and I think I have some growth on the membranes. Salinity of the product is too high so I tink I might have some growth.
Besides the biocide from West marine, where can one buy sodium metabisulfade? I went to CVS and the pharmacist was looking at me like I was speaking foreign language. But he told me to go to a local highschool and ask the chemistry teacher if I can borrow some.
Then I went to a water filtration place and the guy was not familiar with it. He told me to just get new membranes???
Anyway, I think I'll go get the west marines stuff for pickling but i'd really like to know how to get a PH of 12 using TSP.
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Old 14-01-2007, 08:43   #2

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You could use TSP and mix with distilled water until you reach the correct pH using simple pH strips like these, often used in HS chemistry classes:

pH Indicator Test Strips: Determine pH Levels Fast & Accurately.
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Old 14-01-2007, 10:25   #3
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Pet stores that sell tropical fish carry supplies for PH balances..................._/)
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Old 14-01-2007, 10:39   #4
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Industry standard caustic for membrane recovery is Sodium Hydroxide.
Upcomming 'standard' for acid recovery/sterilizing is a mixture of Peracetic acid and hydrogen peroxide (

pH strips commonly available from sources such as Fisher Scientific, VWR, or Edmund Scientific. .... laboratory/science suppliers.
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Old 14-01-2007, 12:24   #5
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A 1% solution of chlorinated trisodium phosphate is Ph 11.6 Ė 12.0
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

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