對於濾水，我從來都不太熱衷。我自己接受到溪水，甚至泥水都幾乎得！我廿多年前開始露營，當年飲溪水實在係家常便飯，當年亦無咩人提過濾呢個問題！
In this short article, we're not dealing with brand and types of water filter, I just want so share the system as whole, how to make it simple and stupid, convenient and effective.
呢度唔講牌子，唔談類型，只講點樣配置可以令到件事最簡單，方便又好用！
First of all, let's talk about the simplest case. In this situation, we have tap water, but then it could be yellowish and somehow even muddy. The source should be untreated stream water through pipes, and it was not used actively so that the pipe could become rusty and the water could become muddy. A simple domestic tap filter could be used with great results:
首先講最簡單既情況。有時露營場有水喉，但啲水卻可以好黃或者有沙泥。呢種水喉九成係山水，呢啲水本身已經有沙泥，再加上用既人唔多，閒日更加無人用，所以啲沙泥會積聚。呢種情況買個家用濾水頭已經好唔錯！濾過好過無濾好多架！至少濾完已經無沙泥。
These filters could be very cheap and effective, but one might want to apply secondary filtering.
呢種過濾頭好鬼平，但又已經好有效。當然，有潔癖既可以考慮再過濾一次，好似以下咁情況。
The next configuration could be a bit more complex. In that case, you have a dirty water reservoir, you have a clean water bag, and in between, you have the filter attached. To make the filtering automatic, gravity is very effective and simple to use.
呢種情況比較複雜，首先，要有一個未過濾既水袋，又有一個裝過濾咗既水，咁中間當然就係放濾芯。要令到件事最簡單，萬有引力就最好喇！吊高佢，慢慢滴，唔使手動，不必用電。
Notice that once a bag was used as the "dirty" water reservoir, one should reserve it for that particular purpose. The above setup was used as secondary filtering. The use of primary water tap filter could make the life of your filter longer apparently.
記得用過嚟裝未過濾既水袋就最好永遠都用返嚟做呢個用途，用既時候標示清楚，免得混亂。上面呢個陣已經做再過濾都得，其實係一樣既！不過咁，如果係有水喉過濾頭搞咗一次之後，你枝貴價濾芯就可以長命一啲！
Let's take a close look of such system. On the top, you have a dirty water bag filled with unfiltered water, in the case below, it's a hydration bladder for hiking. I cut the pipe short for simplicity. The other end of the pipe was connected to the water filter, for example, life straw or sawyer filters has interface ready for that purpose.
以下用日間照片等大家睇清楚啲。上面裝未過裝既水，我用平價行山飲水袋，剪短條喉可以令件事簡單啲，另一邊就駁濾芯。坊間如 life straw 或者 sawyer 之類都可以直駁水袋條喉，因為佢地都設計成可以直接飲！所以呢種駁法係最簡單，唔使搞 adapter...
To allow faster filtering, one should remove any air within the pipe before attaching the filter.
留意返，條喉有時會有空氣，最好駁濾心之前就放少少水，逼走啲氣先，咁出水會快勁多！
The clean water bag was placed below to collect filtered water. A clean water bag with a tap could be a very convenient choice.
收集已過濾既水袋當然放下面，正所謂人望高處，水往下流！我用咗個有水龍頭既水袋放下面，攞水時就極方便喇！
I have a short video below to show the speed of the filtering, and how the system works:
講咁耐，其實出條片是咪最簡單呢！
It's faster than expected.
原來都過濾得幾快架！
The hydration bladders took about 2L of water, and the clean water bag below holds 4L. In the water source is close, you don't need a third dirty water bag, but if it's far away, it's nice to keep one more bigger dirty water bag and it could be nice to let the mud precipitate first before filtering.
我呢個行山飲水袋可以裝 2L 水，下面個水袋可以裝 4L。如果水源近，就咁兩個水袋就夠晒！但如果水源要行得遠，最好就要再多一個大既水袋，用嚟裝未過濾既水，免得要走好多轉！多一個大水袋亦有個好處，就係俾時間啲水沉澱吓先再倒入去過濾。
分享住咁多先！
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