Update - "Fizzy" water from catchment

[Guava girl]

We recently had our roof painted with good quality exterior paint. A few days later, water from the taps has been coming out fizzy, almost with a head on it, like a beer poured into a glass. We don't normally drink the water even though we have a UV filter. Still, I'm concerned about the water quality for bathing and cleaning. Has anyone had this problem? Could it be related to the new roof paint or just a coincidence in the timing?

Mahalo for any advice.

---Found out online that the inlet water feeds from the roof to tank should have been disconnected before the roof was painted and left undone for a few weeks to let the runoff from the paint job completely clear before reconnecting the lines back to the tank. Sure wish our painter knew about this. Hope someone can benefit from this info before the same mistake is made. So easily avoided if we only knew

[Rob Tucker]

Mahalo for the update. That is interesting and people should take note.

[EightFingers]

Make sure catchment is full before painting roof. Check.

[hotinhawaii]

I have had problems here with latex paint not drying quickly and forming a slimy, greasy film on the surface. It is something with leaches out of the paint as it dries. It usually goes away on it's own in a few days. The technical term is surfactant leachate. I imagine if this stuff is on a roof immediately after painting and washes into the catchment that it will cause problems. A few weeks should give it time to dry up or rinse off before connecting the roof back to the tank.

[Jay Bondesen]

In my time as a coatings contractor the process is called exudation and is related to temperature and humidity. Some of the acrylic resin or surfactant comes to the surface rapidly rather than slowly drying out. Kind of a sticky or slimy residue but it will wash off over time. Not great but probably not poisonous either. On the other hand the normal oxidation of acrylic house paint over time, maybe 5% of the thickness annually, will leach heavy metals into the catchment. These are part of the paint pigment and some are added to keep (kill) mold from growing on the paint. The baked on enamel that comes on metal roofs is something that we can not reproduce but it is much better than house paint as far as catchment goes. That being said, for all I know a carbon block filter will clean it up fine.

Jay