This is not a popular topic, but it is a necessary one . . . What may your textile screen printing shop pour down the drain and what may it not?
We’re talking about chemicals here — the kind of stuff used in the screen reclaiming process in particular. And it doesn’t matter whether your shop uses a dip tank or a bucket and brush, the safety and pollution issues are the same. In fact, some printers erroneously believe that dip tank chemistry is more drain safe than bucket and brush chemistry.
And, most importantly, labels can’t be relied on to keep you on the right side of your conscience and the law. Just because a container is labelled “drain safe” it doesn’t mean that it is flushable in your jurisdiction. It all depends on local laws. It’s therefore your responsibility to find out whether the chemicals you use are allowed to be flushed into the sewer system.
If the chemicals in question are not flushable into your local sewer system, you have decisions to make if you are to stay on the right side of the law (and there’s also the matter of conscience). You will have to either change chemicals or find an alternative method of disposal. This is of course likely to result in additional expenditure, but consider the alternative – – fines, potential forced downtime etc.
Let’s not kid ourselves. While it’s a lot better than it used to be, we all know that the textile screen printing process relies on certain chemicals, some of which can be pretty nasty. To be safe and compliant, it’s best to establish with the local authorities what your shop can and cannot dump into the sewer system.