Vinegar to clean water system..How and how much?

How to Remove Limescale

A quick Google search found the above link.

IIRC the reaction between the dilute acid and the scale produces CO2 gas, so after adding the vinegar and pumping it into the piping I would leave a faucet open to avoid pressure build up.

From the look of your hose, you have really hard water where you live.

I'm told you run vinegar through coffee makers to get rid of scale and have done it. Seems to work fine. I went all the way at 100% for that.

I was told vinegar cleans out deposits of lime or hard water. Also told vinegar doesn't "sanitize". Just cleans out deposits. I've been cleaning out the hot water tank about every 6 weeks and can see the build up of lime or scale or whatever when I flush it out. So I'm sure there's more in water system. When washing the car if I don't dry off all water there are hard water spots that stick forever. Was also told that somebody with a "hard water tester" had reading of 1033. I assume that's a bad number but not sure compared to what. Cleaned out hot water tank yesterday and probably got 2 thimbles full of build up.

Here is pic of black tank water hose with the build up on it.

What scale? Flushing the water heater tank with fresh water at the beginning and end of each season has always been sufficient for keeping the tank free of any residue. Sorry, I've never heard of using vinegar for scale removal, only for offsetting any bleach smell. I tried it once but felt the vinegar smell was worse than any bleach smell so in the spring after draining off the RV antifreeze I just flush the system with fresh water and I'm good to go. :)