Quote Originally Posted by GluteusMaximus
That faucet water purifier is not doing you any good. If you use RO water you remove everything from the water so that your ppm will be zero when you start adding nutes.

I can't stress enough the value of Reverse Osmosis filtered water. By removing everything from the water, there isn't anything left to raise the ph. The added benefit is that you also don't have anything in your resevoire that doesn't belong there. You know the only thing in there is what YOU put in there.

GM
Very good point but if you do use RO water (I swear by it my self) then you must also use CalMag Plus to replace some of the nutrients the plant needs but is removed by the RO process.

Around here you can buy RO water for 20-25 cents a gallon. You can fill 5 gallon buckest and if they ask just say you are changing the water in your fish tank.

It's the plants disguard nutrients and other things that change the Ph every day. The less nutrients you use the greater the Ph swing. There are buffers in the nutrients that help keep the Ph in balance but you still need to adjust the Ph about twice a day.