I do not recommend aerating, or hydro jetting a block cesspool it might collapse even if you have an experienced technician performing the service! The price you paid for aeration wasn't that bad, but your probably better off putting your money to a new system!3 years ago we bought a house in Ronkonkoma that was built in 1955. Being from nassau, we know nothing about cesspools. A company came and aerated and added chemicals. He said the cesspool was so old, he was afraid it wouldn't withstand a pumping. That pumping vibrates the form and ours is so old he didn't want to risk cracking it. We paid $275 for the visit. Our washing machine drains better now, but after reading some posts, I'm afraid we got scammed. Should it be pumped? Does age have anything to do with it? Any advice would be welcomed. Thanks.
You probably have a block cesspool, they used to build cesspools that way, it was the standard back then, they would dig a deep hole in the ground and lay courses of block in a circle, and gradually taper the blocks in with each new course of block! Now we use steel reinforced precast concrete rings, slabs and/or domes! Although you can pump a block cesspool you don't want to empty all the water from a block cesspool, the pressure helps keep the blocks held up like a deck of cards, with no pressure pushing out on the bottom courses of block they can fall apart, once cesspool blocks start to fall out the structure will collapse! Especially with years of degradation from acid treatment, and even general PH levels in the discharged sewage, grey water (sink, shower, laundry) and salt, will all corrode the concrete in a process called efflorescence! You should probably replace your system, if you choose not to replace it, keep your children, yourselves, and pets away from the location of the cesspool! Laundry detergent will degrade the lifespan of a cesspool, this is why laundry systems are sometimes separate from septic, and cesspools for sewage!