sparklepants said:
Ok,ok. I got this vacuum deal. It goes in the skimmer kinda, got it. WOOOOOOO. And I poured in the DE and so far so good cause it's not spitting it out yet. Also today I learned that diatomaceous earth burns your skin. Wee!
Ok now when I check the filter, how do I do so and how to I clean it, do I have to open the whole thing up and hose down the grids?
1) DE does not burn your skin. DE is made up of the exeoskeltons (silica based I believe) of small organisims called diatoms. These exoskeltons are very very very sharp on a microscopic level. They "cut up" all sorts of bacteria and other nasties as they flow over it. They also make an effective filter cake for larger particles. As an added bonus they will shred up your mucus membranes or lungs should you inhale a snootfull of the stuff - thats the danger with it. I used to do some work in a greenhouse and we would mix the stuff into the soil. It cuts the skin of all sorts of pests and causes them to dry out and die. It may irritate your skin, but it does not burn it like an acid.
2) When the filter runs, "stuff" gets caked on the fingers that are inside the filter. As stuff gets caked on, the pressure goesup and the filter ability goes down. The caking is not equal over the entire finger structure. When you bump the handle, it shakes the fingers, knocking this suff down to the bottom of the filter. When you turn the filter back on it redistributes, hopefully in a more even pattern (some also may stay on the bottom). Eventually you reach a point where there is so much stuff in the filter that bumping will not help.
3) You can backflush to clear out the "stuff" when needed. You bump first, knocking all the stuff to the bottom. Then you open the vent on top of the filter and the drain on the bottom and flush out all the stuff that is sitting on the bottom. You then have to close the drain, purge the air, and recharge with DE.
4) If you want you CAN remove the top of the filter and wash all of the fingers. This will clean the filter better than just backwashing, but I would not do it if I were you. The fingers can be damaged if handled roughly, it can be tricky to get the top back on (depending on the type of clamp you have) and you do need a large enough bucket to put the fingers in. I do it to mine, but I would not do it to a filter that I was pool sitting for. Backflushing is enough.
There has to be a way to override that pump (makes me love my mechanical timer all the more) because you will need to stop and start it a few times to backflush.
-dave