While Rid-X is designed for use in bathroom drains and toilets, it can also be used in other types of plumbing, according to the manufacturer. It is safe to use in garbage disposals, K-57, mound systems and outhouses.Click to see full answer. Similarly one may ask, can Ridex be used in sewer lines?Rid X is made for septic systems where the bacteria is contained and does it’s work. It will jusr flush through the toilet and sewer lines.Likewise, how do you use Ridex? Directions for use: Pour entire box of Rid-X® into the toilet flush twice and discard container after use. For best results, flush Rid-X® when plumbing will not be used such as before going to bed or leaving home for the day. Rid-X® 9.8 oz is 1 monthly dose for septic tanks up to 1500 gallons. In this way, can RIDX be used in sinks? Rid-X has a Septic Tank Treatment product that can be mixed in warm water and poured down the sink and or flushed down every toilet. The enzyme is totally safe to pipes and fixtures and actually breaks down the oil, solids and waste inside the plumbing waste pipes, safely and inexpensively.Is Ridex bad for septic tanks? Using Septic Tank Additives Myth: I just flush some Rid-X or yeast down the drain to keep it healthy. Fact: The human body uses many enzymes to break down our food into small particles. Those enzymes are plentiful in our sewage and septic systems, so additives are an unnecessary addition to a septic tank.