understanding light

[Luci_ferson]

lol dude I tried not to go into too much depth , just enough to explain the importance of understanding it.

its good to see im not the only Geek in the village

loved the bit on ph, was considering that myself in my post on water science. but decided against it as it would have put off the techno phobes.

thanks loads for your input Hrusai, greatly appreciated.
its good to know atleast one person didn't read it and just get confused.

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Kh is just carbonate hardness (dissolved salts)
tds is total dissolved solids ( it includes the dissolved salts and dissolved organics)

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carbonate hardness is a buffer that trys to keep the ph stable. the higher the kh the more stable the ph
if you add acid to high kh water it will lower the ph but the ph will just rise again, and the kh will lower.

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until the kh becomes too low to act as a buffer and then the ph will start to remain where you altered it too.
this can require a hell of a lot of acid if the waters kh was very high.