this will work for most issues
i'm chiming in because people really seem to be struggling with this product. the fact is that practically ALL effective drain cleaners are sodium hydroxide (aka caustic soda), and it's the only thing that works on hair (unless you have the cash to pour Nair down a sink). this is a very effective and dangerous chemical, although you might need more than the recommended dose, and clearly people are not very competent at working with caustic soda. [i buy it in 20kg sacks of pure crystal, so i have a head start on some of you]
the FIRST point is ...this is dangerous stuff. not actually toxic, but if it dissolves hair it dissolves skin and eyes like nobody's business. if you cannot do this without splashing your eyes then *don't*. don't splash your skin either, but if you do at least you have time to wash it off with cold water. however, the fumes aren't toxic. caustic soda isn't volatile. draino also generates hydrogen but that isn't toxic. you might find your blockage sludge is on fire or evolving weird gas, and i don't guarantee that's not toxic but personally i'm not too concerned. if your better judgement says everything is too hot, add generous cold water but beware that incomplete reactions might hurl material back out the sink hole. i would totally turn on the cold tap and leap out of the way if i suspected fire or melting, but this has never happened to me USE: draino includes aluminium flakes, which are only there to react with the caustic soda and produce heat (and generate hydrogen gas, which is a little dodgy). if you use straight caustic soda (which is cheaper) you regulate temperature with the temperature of the water you pour in after it. bearing in mind that, depending on purity, caustic soda alone can get hot when mixed with water. i don't know about draino, but caustic soda doesn't damage stainless steel, brass, or your PVC plastic drain pipe. most notoriously, it's murder on aluminium, which is also why you don't put aluminium in the dishwasher. i suspect the limit on the draino dose is that it reacts, so a large quantity might explode. you have much more leeway to use a silly amount of pure caustic soda. heap it on or in the drain, and slowly add water *away from* the drain until everything's down the drain AND any violent noises stop. then you can start adding water faster, and if you hear the blockage break up, flush with plenty of cold water to wash it out and also cool down anything that's dangerously overheated. this is not advisable, but if i had a tough blockage and i HAD TO use a large amount of drano, i would slowly put that in the sink first (pausing if things sound violent) and then trickle water very slowly, away from the sink, until it stopped making noises. if it's fairly dry down there, you can limit the reaction by limiting water. personally, i would always use pure caustic soda if you fail to remove the blockage and you have a lot of water in the sink, there are very few situations where the water won't eventually drain away, and you can try again with more product and hotter water. you'd probably want to consider some plunger action at this point too. but bottom line, you're dealing with a very powerful product and my own experience is that most blockages clear up in seconds. whoever said crystals can't dissolve hair was dead wrong (!! although this might be a limitation on the amount of draino you can use in one go, vs the less reactive caustic soda). toilets, however, are different: they often have wax gaskets, which melt if you expose them to heat. technically, you shouldn't be attempting to unblock a toilet with any sort of drain cleaner
Doesn't work for hair clogs
Tried this for a bathroom hair clog in the sink and bath. Made the problem worse! Created a mess and lots of fumes. Went to Bunnings and got their hair clog product instead which saved me. The guy there explained that crystals only really work on grease.
It only gives bad smell and bubble, and nothing worth. Now my bathtub is completely blocked. The smell was so bad that I could not enter my toilet and repeat the steps. But anyway I repeat it with my mask on. After 3 times of the process, my tub is completely blocked and now is time for a plumber =.=
Fixed up the issues no problem
Mums kitchen sink has been making gurgling noises for years now and she was starting to get annoyed because it’s pretty darn loud - and embarrassing.
I thought I’d give this product a go as my workplace sells this and it looked convincing.
Now, the packaging says this product is meant for slow running drains but this wasn’t my issue here.
I followed the instructions carefully, instructing Mum to as well when I’m not at the house. 2 heaped tablespoons of the crystals, and a cup of cold water to finish it off - straight down the drain.
After 12 minutes of waiting, I ran the tap with cold water for a few seconds, waited for a bit, which the gurgling started soon after. I repeated the process once more.
Used to work
They changed it for sure. We never use it or recommend it to anyone now. All it does is release toxic gases that stink out the unit and just hisses and bubbles away without de-clogging the sinks pipes. I had to use the plunger while wearing a gas respirator and rubber glove to clear the drain as over an hour after using it, it still didn't do anything.
This stuff is really dangerous
We had a blocked drain in the kitchen sink and I thought I'd try Draino. Next thing you know the crystals began bubbling and giving off noxious fumes. They were so bad we had to evacuate our house and spend the night at a hotel. I looked up the web curious about the ingredients, Sodium Hydroxide? Check it out, that's what were breathing in and it's not good for you. It might be safe for toilets perhaps but use with care and breathing mask if used in sink. The next day I solved the problem by undoing the S bend under the sink and clearing the gunk trapped there.
- Verified purchase
Will only work in certain situations
A drain can be blocked by many different things and as you don't usually know what it is, the best solution is to start out by using a plunger, which will usually work. If the blockage is caused by hardened fat or grease, a sodium hydroxide based product is best because it transforms grease into soap. This works best when hot, thus the ideal product is Drano crystals, which is sodium hydroxide with aluminium flakes. Once wet, the sodium hydroxide attacks the aluminium creating heat, hydrogen and thus pressure. If you hold the plug AND the s...ink overflow hole closed with a GLOVED hand the pressure can help to blow out the now loosened blockage. A dangerous product but the best in the world: I've lived in several countries and no other has Drano crystals, I miss it!
Works exactly as advertised
Had a slow-draining bathroom wash-sink, with water from hand-washing taking many minutes to drain away. Two tablespoons then a cup of water (not accurate, just turned on the tap for a second) as per the can's instruction, and left it to fizz. Came home, and water gurgles its way down the drain, instantly. I was as surprised, as when I saw the (sigh) coloured beads, and shavings of what look like magnesium, I thought: bet it's all show and no go. I was wrong, and its under the sink ready for when the slow drain reappears. Should last for years.
Now my bathroom sink is completely blocked.
My bathroom sink was draining slowly recently, went to Big W and bought this for $12.
Used it as suggested, and 3 rounds later (no more than 3 times as suggested), it is now completely block, with green colour floating on top and making the sink green.
Thank you Mr Muscles!
Completely useless. Don't buy.
I should have read these reviews earlier. Bought the product for a blocked kitchen drain and used liberally to absolutely zero effect. Went out and bought a $2 plunger the next day and the problem was fixed in literally two minutes. This product is absolute rubbish.
No instructions as to concentration or how much to use!
This might be a good product. But without concentration or recommended 'dose', it risks overuse (I'm sure that's why the information is missing, too. I've used drano crystals for years and i know the amounts were in tbs or tsp, ml or g. I'm a chemist, and this schocky lack of info annoys me
No instructions as to concentration or how much to use!
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