We use the green bag "iron fighter" salt in our water softener for our well water. We'll get the same discoloration in our toilets, tubs, etc. The green bag salt helps immensely. You also might need to remove the bacteria from your well and house pipes. Does your water have a scent to it? I clean ours twice a year to keep the bacteria level down. We aren't on a beach, but well water is well water.
One more thing. This stuff is by far the best thing we have ever used for making the stained toilets pure white again. It really works. A big bottle is like $8-10 on Amazon. Look for the 32 ounce bottle. Click to follow link...
What is the source of the tannins in Carova?
Wondering if anyone has dealt with the rust water issue on the beach out here? I recently purchased my place out at the end of Carova beach. The house was built in the 70's and I'm pretty sure it's a fairly shallow well. Right now we have a pretty elaborate water conditioning system as well as a 6 stage reverse osmosis filter for drinking water BUT the shower and toilets still stain after a while. Any suggestions? Thanks