First off, I would recommend starting a grow journal so that people can read exactly what you've done since the day you started this journal...you would list the type of lights your using, how many hours they are on, what type of grow you have, what type of seeds, how many air pumps you have, how many air stones, etc. .... this is so people can help you out and give you the best advise out there
As far as your current setup... hmmm.. I would need to know what lights you have, how big your rockwool cubes are, how big your plants are, how long the roots are, what nutes do you use...
I have a 150W HPS and therefore I had to water my rockwool every 5 hours (ruffly). When the top of the rockwool is dry the bottom is probably still wet. When i watered I just dumped enough water on the rockwool until it dripped into my reservoir.
Currently, I do not need to water my plants, they water themselves. My plants have long enough roots that they just rest in the water below and suck it all up. This took 2 weeks to happen from the start of my grow.
So it really matters what your grow setup is like before i can give you the best answer....
Take as many pictures as you can.....pictures, pictures, pictures
Pictures speak a thousand words
How noisy is that water pump?