Here is a painful learning lesson that I'd like to pass on to all the new people out there. I recently changed to filter socks. I was advised to put the socks in the washer, add 1/4 cup bleach, rinse twice and hang to dry. Because of my tunnel vision I ended up killing 1/2 my corals and the others are still trying to recover. Granted I'm kind of new at all of this, but I should have really thought the steps through. I screwed up royally.
After changing my sock with a few hours I noticed the corals were closed, I kept watching and new something was terribly wrong. I tested the water and it was fine, but I did a 25 % water change, I also changed my sock. The protein skimmer was going bonkers. In a panic I called "my person" at the LFS and she was gracious enough to come right over. We went over everything trying to figure out what was wrong. We retraced my steps trying to find the cause. The fish looked wonderful, but the coral was obviously dying or in distress. Finally after looking at the washing machine we figured out what it was.
I have a new washing machine. It's they type that you pour the soap in a side cup and it slowly adds the detergent as the washer fills up. I had added the socks set the wash cycle, added the bleach and set the cycle for two rinses. What I didn't realize was there was soap residue in the detergent line. I also didn't realize that soap residue can destroy a beautiful reef in a matter of hours.
.I looked at many new washers before decided on which one to purchase and I can tell you that most of the new washers have the soap dispenser cup.
We discussed it and decided that it's probably best the I not use the washer even on just the rinse cycle, it's just not worth the risk. I'll wash the socks with the hose, both inside and out. I then place them in a bucket with bleach overnight. I will then rinse them with the hose and add them to a bucket with a small amount of prime, letting them soak over night and line dry.
I hope this information will help.