Ninong
I don't believe polypropylene or polyethylene will react or they wouldn't use them to store acids.
You are correct. I'm just saying that certain solvents react with different plastics, i.e. put some laquer thinner in a polystrene cup & it will dispolve the cup, etc.
However, the materials description for the container that I linked to above just says: PF. So what is that the abbreviation for?
PF = PVF = Polyvinyl Flouride. PVC, PVF, PVDC & PVDF = Polyvinylidene chloride or floride.
Very similar properties & characteristics.
Regardless, Ltspd on Reefland tested his fresh RO/DI water and it tested fine. He tested it after a couple of days in his Rubbermaid container and it tested with high TDS and phosphate (the two tests that he ran).
Like you are refering with only 2 tests, limits the extrapolated interpretation of the results.
To many factors that could affect the test.
The response from Rubbermaid was that their containers do leach chemicals unless you purchase one that meets USDA requirements:
This is call "Tort Liability" = "cover your A#$"!
Numerous products mfgd by Rubbermaid are used for water containers that are not "Food=grade".
Looking very quickly through their website, it mentioned:
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FDA Compliant materials = to the level of purity of the ingredients
.
The only real difference btw the foodgrade & regular is ingredient quality, 0% recylced & approved plasticizers.Majority of the materials mentioned on their site was polypropylene, polycarbonate, polystyrene & vinyls.
Website:
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Gray, White and Yellow are USDA Meat & Poultry Equipment Group Listed and assist in complying with HACCP guidelines.
means purity of ingredients, HACCP = Hazard Analysis Critical Control Program - means containers meet requirements for all liquids used in meat / poultry process.
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Certified to NSF Std. #2 (qualifying gray, white and yellow) and Std. #21.
NSF = National Sanitation Foundation. Means its meets with FDA for use with approved santitary liquids & color standards.
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2643 is California State Fire Marshal (CSFM) Approved For Fire Safety when used with 2647.
Meets fire (fire retardants) safety / flammability requirements. ALso correct color coding for process use.
Nothing above has any effect on the product materials either way that affects the reef tank enthusiast.
I have reviewed numerous plastic manufacturing companies over the years and there really isn't that much difference btw food-grade & regular plastic products that would affect the saltwater reef tanks.
Again, this is a personal decision, but, there is no difference / concern when using the numerous, commercially available plastic containers, JMO.