# Why feedwater to boilers is maintained to 0ppm pure ? while we drink 80ppm impure water

**URL:** <https://forumautomation.com/t/why-feedwater-to-boilers-is-maintained-to-0ppm-pure-while-we-drink-80ppm-impure-water/2349>\
**Category:** Interview Q & A\
**Tags:** interviewquestions, instrumentation\
**Created:** [September 26, 2017, 12:24pm UTC](https://forumautomation.com/t/why-feedwater-to-boilers-is-maintained-to-0ppm-pure-while-we-drink-80ppm-impure-water/2349 "2017-09-26T12:24:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sivaranjith](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/ba9def/32.png) [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Post date:** [September 26, 2017, 12:24pm UTC](https://forumautomation.com/t/why-feedwater-to-boilers-is-maintained-to-0ppm-pure-while-we-drink-80ppm-impure-water/2349/1 "2017-09-26T12:24:33Z")

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If someone ask you this question, while drinkable water for human being ‘needed’ 80ppm of impurity. You have to know that it is because of osmosis that we should drink 80ppm impure water, so that water can enter into our body tissues.  
while boilers need 0ppm pure water because impurity deposits at the bottom of the boiler, which cause reduce in heat exchange. this is known as **fouling**. chemical impurities like O2 and CO2 also should be removed, so that **Boiler corrosion** can avoid.