Blocked drains are perhaps one of the most common problems in any household. Be it a sink, basin or toilet, drains get blocked each day and cause a large amount of headaches. Pouring bleach down the sink works to a certain degree, but after a while something must be done to unblock it. And if you're responsible for a public building just like a school or then the drains are probably have to a whole lot more than just bleach.
The best piece of advice when dealing with blocked drains is: don't try and unblock it yourself. Drainage services companies often find that if they are called out, they have to deal with a much worse problem than it the client hadn't tampered with the drain themselves. Instead of just dealing with the blocked drain, they suddenly end up met with a blocked and damaged drain, creating much more work. This is not only frustrating for the drain clearance company, but ends up costing the client much more.
You can find two principle methods utilized by drain clearance companies to clear blocked drains. The first is manual rodding. Manual rodding is virtually what you believe that it is: using a long metal rod to manually clear any debris blocking the drain. It is useful where there isn't much space, but amateur attempts at doing this are one of the biggest causes of drain damage. It may sound like a spectacularly simple methodology, but it is a lot more involved than one might assume.
The second, far more exciting technique is that of ruthless jetting. Again, the moniker given the technique makes an explanation almost redundant. However, it really is worth noting that ruthless water jetting is indeed effective that it is also used for a number of other applications, such as cleaning gum of pavements and car parks. If More help find enough space to properly utilise it, ruthless jetting is the best approach of clearing blocked drains, as it also cleans residue from the medial side of the drain that could otherwise eventually build-up into a blockage.
As such, high pressure jetting is a technique that's sometimes used pre-emptively to prevent blockages, rather than looking forward to the drain to get blocked at all. This is particularly ideal for large public buildings where a blocked drain could easily spell disaster and lost working time.
Blocked drains is definitely an enormous headache. The great thing you can do to avoid further headaches in the future, is call a specialist.