Like I said I understand why you would leave (not filter out)bleach in your main tanks until right before you use it. But I'm just going to repeat that your skin and lungs absorb present toxins when taking a
shower. Also my NSF 53 filter lasts for over a year filtering all the water I use so it's not really an extra expense. My system is two standard 10 inch filters a
cheap one and then the NSF 53 and then "aquarium" charcoal that I change every couple of months.