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Black Tank · Grey Tank · Sensors · Drains
Break Down Sludge, Solids & Odor in Your RV Tanks.
Bio-Pure RV Black Tank & Drain uses proprietary microbes to break down organic matter, bottom solids and scum — eliminating odors at the source instead of covering them up.
- Breaks down waste, solids and scum
- Eliminates odors at the source
- For black tanks, grey tanks, sensors and drains
- Safe for all pipes
A liquid with a citrus-ginger scent, or a super-concentrated powder. Made in the USA.
100% satisfaction guaranteed
Made in the USA and backed by 30+ years of development and testing.
Choose Yours
Liquid or powder, same job
Treatment counts depend on your black tank: each container treats a 20–50 gallon tank the number of times shown, or a 55–88 gallon tank half as many.
Liquid — 32 oz, two strengths
Citrus-ginger scent. The bottle has a built-in measuring chamber marked in fluid ounces.
Concentrate
32 oz · 300 million CFU/oz
16 treatments for a 20–50 gal tank
or 8 for a 55–88 gal tank
The everyday strength.
Super Concentrate
32 oz · 600 million CFU/oz
32 treatments for a 20–50 gal tank
or 16 for a 55–88 gal tank
Twice the treatments from the same bottle.
Super-Concentrated Powder
Dosed by the scoop. The 14 oz and 48 oz cost less per treatment than either liquid — about $0.75–$0.88, against $0.94–$1.16.
4 oz
2 billion CFU/oz
16 treatments for a 20–50 gal tank
or 8 for a 55–88 gal tank
Try the powder.
14 oz
2 billion CFU/oz
56 treatments for a 20–50 gal tank
or 28 for a 55–88 gal tank
More than three times the 4 oz.
48 oz
2 billion CFU/oz
192 treatments for a 20–50 gal tank
or 96 for a 55–88 gal tank
The lowest cost per treatment.
Liquid or Powder?
Pick the format that suits how you travel
Choose the liquid if…
- You want a built-in measuring chamber
- You like the citrus-ginger scent
- You'd rather pour than scoop
Choose the powder if…
- You want the lowest cost per treatment (14 oz and 48 oz)
- You travel full-time or treat several rigs
- You'd rather dose by the scoop
How To Use It
Three ways to use one product
Routine black tank
Add a dose for every 50 gallons of tank capacity directly to the toilet, and flush.
Grey tank & drains
Every 2–3 months, mix a dose with warm water and pour it into your shower, sink and laundry drains. Leave overnight.
Soak & clean-out
A larger dose that sits in a part-filled tank to break down built-up solids. Steps below.
Black tank clean-out
Drain the tank
Empty the black tank as usual.
Refill it halfway
Fill the tank to about 50% with water.
Add the clean-out dose
Pour it directly into the toilet and flush.
Let it sit 24–72 hours
Give the microbes time to work on the buildup.
Drain again
Empty the tank to flush out what was broken down.
Exact doses differ by product and strength — they're on each label and product page.
What's Inside
Proprietary, task-oriented microbes
Microbes that break down organic waste and reduce ammonia-, nitrate- and hydrogen-sulfide-forming bacteria and their odors. Counts per ounce, from the labels:
300M
CFU/oz — Liquid Concentrate
600M
CFU/oz — Liquid Super Concentrate
2B
CFU/oz — Powder
Safe for animals, humans, plants and pipes, and environmentally safe. All natural and biodegradable.
Common Questions
Before you buy
What's the difference between Concentrate and Super Concentrate?
Both are 32 oz bottles. Super Concentrate has twice the microbes per ounce (600 million CFU against 300 million), its dose is half the size, and the bottle gives twice the treatments: 32 against 16 for a 20–50 gallon tank.
How much do I use?
One dose per 50 gallons of black tank capacity: 2 oz of Concentrate, 1 oz of Super Concentrate, or one ¼ oz scoop of powder. A clean-out uses twice that.
My tank is bigger than 50 gallons.
Scale the dose to the tank. The labels give counts for a 20–50 gallon tank and a 55–88 gallon tank — a larger tank gets half as many treatments per container.
Is it safe for my RV's plumbing?
Yes. The label says it's safe for all pipes, and the directions list it as safe for animals, humans, plants and pipes, and environmentally safe.
Can I use it on a boat?
Yes — the directions list RV and boat/marine septic and drains.
Break it down. Keep the odor out.
Bio-Pure RV Black Tank & Drain — for black tanks, grey tanks, sensors and drains.