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Every three to five years for a typical household, and more often for a small tank or a full house. The right answer depends on the sludge and scum depths we measure rather than the calendar, which is why we record them and tell you when to book the next one. Pumping is far cheaper than a leaching bed, and skipping it is the main way beds get destroyed.

Slow drains throughout the house rather than in one fixture, gurgling, sewage smell in the yard, unusually green or spongy grass over the bed, or effluent surfacing. Backups after heavy rain point to groundwater getting in. Any of those means stop adding water to the system and call — a bed that is beginning to fail can sometimes be saved, and one that has been pushed for another year usually cannot.

Wipes of any kind, including the ones labelled flushable, plus feminine products, grease, paint, solvents, and large amounts of bleach or antibacterial cleaner that kill the bacteria doing the work. Garburators roughly double the solids load. Water softener discharge and a water treatment system dumping into the tank are also common causes of trouble.

Yes, and it is worth insisting on a real one — tank opened, sludge measured, baffles checked and the bed walked — rather than a visual glance. Replacing a system runs into serious money, and it is the sort of thing better discovered before closing than after. We provide a written report you can give your lawyer or lender.

There is no good evidence that they do, and some of the harsher ones can push solids out into the leaching bed, which is exactly what you do not want. A healthy tank generates the bacteria it needs from normal use. Regular pumping and keeping the wrong things out of the drains does more than any additive on a shelf.

Cost depends on soil, lot size, elevation and whether a conventional bed will work or the site needs a raised or advanced treatment system, so it varies widely and we will not guess on the phone. The process is a soil evaluation, a design, a permit from the approval authority, then usually a few days of installation and final inspection once approval comes through.