plants began to wilt

[Mark]

Hello Ron,

I started a small NFT system three weeks ago. Today I changed out the solution and made a new batch using the same formula as before. However within an hour the plants began to wilt as if they were not being watered at all. The NFT system I'm using is a constant flow, it was down for no more than 5 minutes while changing the solution. Any ideas why this would happen? The only difference I can see is the water temperture...the old batch @ 74 degrees the new batch @ 63 degrees. The plants have recovered, but I would like to know what to do differently the next time.

Thanks Mark