Walex Bio-Pak Black Holding Tank Deodorizer & Waste Digester Drop-Ins - Advanced Enzyme Formula for Rapid Breakdown of Waste & Paper, Removes Odors & Cleans Tank; Tropical Breeze, 10-PackCompact by Design (Amazon-developed Certification)

They work awesome. Eliminated all funky smells.

I am in a remote off grid cabin and have a little camping potty for overnight needs. I have been using it for over a year and never put chemicals or anything but soapy water in it to clean it. But now despite not ever going number 2 in it, it had gotten really stinky to the point that every time I opened the lid to use it, it would stink up the bathroom. I was skeptical but decided to toss one in (with a little water) after cleaning as usual. I am happy to say my potty doesn’t stink up the bathroom anymore. Smiley face! The pouch dissolved quickly and the ‘alpine’ scent is pleasant although not what I expected as a pine scent. But still even though it’s not the alpine I wanted, it still smells clean and fresh. Highly recommended.

Great for that BLACK tank. Used them for years.

Products were great , but delivery package was delivered on the bottom step for everyone to see instead on putting it up by the door .

Just like the others from Walex, these are a must for travel trailer life. Easy drop-in use, and the Alpine Fresh scent actually holds up. Keeps things clean and odor-free without any hassle. If you’re on the road, toss a few of these in your kit — total game-changer.

Excellent product. I highly recommend it. Manages oder well and turns everything to liquid for draining, with out chemicals that cannot be removed in the sewage treatment process. We initially had minor odor issues, but have realized that with any cleaner all fans sucking out air from the camper will suck out air form the toilet into the camper. We also realized that the Thetford toiled provides a helpful sealing action when flushing. So in addition to using this or any product: turn off all of the out take fans and close the lid when flushing. IIt seems to work well for 5 to seven days, the maximum I wait before emptying the tank. If temperatures are 95 and above for several days you may want to use Porta-Pak a chemical based produce.Finally, a note on the use of bio-pad and cleaning agents: Bleach based products and many other chemical based products will kill the enzyme that is the basis of this product. I use Green Works and this seems to be friendly enough. I use other products to clean the toilet just before I dump. I suspect that some to the less positive reviews may relate to this issue. If you are not going to use "chemical" bast agents you have to use similar cleaners.Most additives on the market will reduce the odor associated with raw sewage, but none willl make it smell like a bed of flowers. This product does a great job and it will not have to be removed during sewage treatment. (In most cases they are not removed, just diluted.) Nor will it harm septic systems.(A final note: When talking with manufactures about sented products they note that the scents are for the customers when they open the package. The scents are totally lost when the product is sent into the tank.)

I bought a tiny teardrop trailer in January and set off knowing nothing. Into the California desert where temps in March hit 100 or close to it more than once. P U. These are amazing. I wish these were available in 50 pacs--the blue ones in the 50 pac do not get well reviewed. These are expensive for my budget but an absolute necessity. I have a small holding tank. Things got pretty bad pretty fast. I threw one in immediately and there was improvement. After dumping and closing seal--did another with about 2 gallons of water. About halfway full holding tank (i'm guessing) was stinky again so tossed in another. And another after dumping. after a couple of cycles like that with two per tank, I am now fine with only one per tank. Caveat--left nearly empty tank with bio pak in it for 3 days and returned. Stinky. Best to keep the whole system moving. When connected to city water I take showers long enough to fill up gray tank quickly and then release sewage (does not need to be full), then release gray water tank in a big whoosh to help the sewage clear the hose. This may all be obvious to most people reading this, but sure wish i'd known ahead of time. Awesome Product. I truly love the smell. It is very clean and pretty and does not smell overly chemical or lysol like.

I enjoy this smell more than others. Doesn’t last as long as I would like but the smell is strong