myredracer wrote:
westend wrote:
You may wish to review what that Liquid Drano really is. The MSDS shows it contains lye and other corrosive materials. It definitely isn't friendly to metal pipes.
Our KZ onwers manual says to use Liquid Drano.
This Drano info. says "Safe for plastic, PVC, metal pipes, garbage disposals, and septic systems." Drano says all of their products are safe for plastic and metal pipes here as well. The Liquid Drano Max Gel that we've used says safe for metal and plastic right on the label. Does have lye in it but also bleach, a corrosion inhibitor and a proprietary ingredient. The MSDS sheet doesn't say anything about being safe or not on plastic & metal.
A google search shows 6 different types of Drano in a liquid form - Drano Max Gel, Drano Liquid, Drano Max, Drano Clog Remover, Drano Pro Concentrate and Drano Max Build-up Remover. I didn't know there are so many but all are supposed to be okay on plastic & metal. Have also used Liquid Plumr and it said on the label it's safe for metal and plastic label as well.
The chemical drain cleaners are all, AFAIK, corrosives. There may be some acidic ones but I haven't used any of either for years. There was, at one time, a big push back on using chemical drain cleaners and there was good reason, for the most part. Nearly all drains in a house can be easily cleaned without the use of chemicals.
Hey, use what works for you. Letting the Drano only sit in a drain or tank for part of an hour before immediately flushing isn't going to hurt any of your pipes. Letting it stand in metal pipes isn't advised. I've replaced plumbing in houses that have used corrosive drain cleaners.
I really can't see using any chemical cleaners in an RV system. I sure wouldn't want them in my drain hose. I use some dish soap and the cheapest water softener I can find to scrub up my tank, occasionally.