Does Kalkwasser destroys plastic bottles and containers?


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Hi could anyone tell me if they have also experienced a hardening and cracking of plastic bottles that have been filled with Seachem Kalkwasser? I have been filling 12 2L Coke bottles with Kalwasser and RO to fill my ATO system. I recently found that the bottom of one bottle was cracked but put it down as just a broken bottle. Today I noticed that most of the bottles are cracked at the bottom and very brittle. Now I am worried about the plastic container that holds 20L for my ATO pump. Has anyone experienced anything like this? If I use a glass tank for the ATO will the concentrated KW affect the silicon glue? Any comments will be gladly appreciated.
 
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to be honest i cant prove it but i think it does,
 
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Thanks for you input Leslie. Well then maybe that lends to the idea that I should rather use glass. What does everyone else use for their auto top off reservoirs?
 

hotdog83

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It could also perhaps be affecting the bottles because of the heat it generates when mixing?
 
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