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Old 14-01-2007, 07:18   #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, 07:43   #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, 09:25   #3
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Pet stores that sell tropical fish carry supplies for PH balances..................._/)
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Old 14-01-2007, 09:39   #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, 11:24   #5
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A 1% solution of chlorinated trisodium phosphate is Ph 11.6 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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