Concrete and plastic are some of the most common materials for septic tanks, so it makes sense that many people compare the two when shopping for septic tanks. While there may be many differences between the two materials, here are the ones that are most likely to be of concern to many people:
Cost is always a factor in plumbing issues, so it makes sense that it is one of the things most people want to know when comparing septic tank material. Concrete tanks tend to be relatively more expensive than concrete tanks. According to some statistics, most homeowners spend between $2,447 and $6,772; concrete tanks cost the average of the price range while plastic tanks go for below average prices.
The capacity of the septic tank is the volume of effluent it can hold. You need to consider this because the lower the capacity, the more frequently the tank will be filled with sludge, and you will need to pump it more often than a bigger tank. Not only that but using a small tank reduces the effluent retention time (the time taken by the effluent in the tank before it is pushed into the drainfield) of the tank. An extremely short effluent retention time means that the effluent will be pushed into the drainfield before it is fully separated into clear liquids and solids; this pollutes and damages the drainfield. Fortunately, this may only be a concern for those who have the need for extremely large septic systems, such as religious institutions, schools, and industrial complexes.
Durability and Risk of Damage
The other thing you need to consider is how fragile the material is. For example, concrete septic tanks are more susceptible to cracking than their plastic counterparts. The risk of cracking is especially high if the constituent materials for the concrete weren't mixed in the proper ratio. Cracks will allow effluent to flow into and contaminate your lands, plants or even water. What's more, you may not notice the seepage early enough before it becomes serious.
Plastic tanks don't crack easily, but they can be damaged if subjected to too much weight. For example, driving heavy machinery over a plastic tank can easily damage it (but then again, this is a definite no-no for any septic tank material since it also hardens the soil around the tank). Also, since plastic tanks are relatively lightweight, they can easily float out of the ground when the soils around it become waterlogged.
For more information, contact Parrish Portable & Septic or a similar company.