PH Question

24 hours ago I mixed up the water I've got in my tank (about 70 gal) with salt mix. I've let it blow round the filters since then, and I've just cracked out my salt water PH test kit for the first time.

Following the instructions, I tested the water and the colour chart goes from light green (7.5) to dark blue (8.7) .... my water came out dark purple !!!!

Tap water comes out at 7.6.

Huh ?!? Have I got incredibly high PH (presumably higher than 8.7) or is it because it's only 1 day old water, or what ?!?
 
Oh bu**er .... someones just made a comment and I know what it is now .... the expiry date was 15 Feb 2004 .... I bought a whole shed load of things at the same time (I'm starting up) and the shop assistant picked the box up for me, so I didn't think to check. Been ripped off there methinks ....

A lesson there for everyone .... check expiry dates on test kits !
 
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