Water level question if some one can help

SO HERE WE GO I GOT A BUBBLEPONIC SYSYTEM AND IT HAS ONLY BEEN 4 DAYS SINCE I CHANGED THE WATER AND IT EVPORATED AND MY QUESTION IS DO REFILL WITH PHed WATER ONLY OR WITH NUTES

just refill with ph'd water and try to keep track of how much you replace, when you have replaced the same amount as the reservoir refill with fresh nutes

If you have no testing devices you can mix up 1/4 strength solution and top with that. Once you have put in half the res again you should probably change the tank

IF water and nutes are not an issue, the absolute best would be to relace. You can never tell what nutes have been used even if you know the ppm.

But, most do not becuase of expense, hassle, possible over-kill. Just change every 7-10 days. Top with ph's water, and you should never have an issue.

Get a cheap ppm pen. That will tell you if your plant is drinking or eating more.

Thanks guys