I took my ppm's b4 adding ph up. it was 400ppm then I added the ph up to get the ph right and then took the ppm again. It was 900ppm afterwards! Is this normal or what's up?

i've never had that problem before butit is conceivable that u got a false reading if u were using powder ph up/down. did u use a powder or a liquid. also if u are using a bubbler i find that my tds meter will give false high readings if u are tds'ing over the top of the air stone. best bet when taking readings do it in a calm part of the res. also wait about 2 - 3 minutes after u add ur up and down. hope this helps.

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Good Things Cum to those who wait, but they cum quicker to those who don't.. --Dirty Redd

Thanks a lot monkey, I am using powder ph up and down...is this not a good thing to do? Thanks 4 the help.

no powder is cool but is it a hydroponic ph or a swimming pool ph. swimming pool ph isnot the same and should only be used in on emergency basis. if it is a hydro powder ph then get ursef 2 gallons of distilled water and and putit in a dark container and keep it cold so it wont develop mold. add some ph up to one gallon and ph down to theother gallon. now when u need to adjust it will already be liquid and wont affect ur ppms. also it will be ez er to adjustbecause u already know the ph of the distilled water just adjust ur nute water by adding a lil bit at a time and voila. the next time u need to adjust ur ph a point or so u will know the exact amount to add. good luck bro.

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Good Things Cum to those who wait, but they cum quicker to those who don't.. --Dirty Redd

K thanks a lot it is def pool ph up and down so I guess I'll head to the store and grab some real liquid stuff.
Thanks for looking out...love the pic by the way.