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For GROUND WATER recharging method, do we require a filter?

Also what would be the total cost (if someone can specify the split up, that would be great) for this method based harvesting?

we are following two methods


Rainwater harvesting in underground sump: 10K lts, we have cauvery connection, and when it rains all the water from top floor will be filtered and use here for all household chores. you require filter for this (or can use traditional low cost method, jelly/sand filtering layers)

Once the sump is filled, then the extra water will be redirected to

Recharge Well: 20 oft Deep 3ft Dia, lined with concrete rings, house still under construction so not yet connected Pipe, all the water that drained to this will be recharged to underground. we have not dug a bore-well


Grey water Treatment: Still planing, Architect promised that it's pretty easy and she has done so many times that we will have it by end of construction. cost not yet known

some more information
http://kscst.org.in/rwh_files/rwh_rooftop.html

thanks kragham.

I am still trying to figure out what is the requirement from BWSSB for RWH for Ground Water Harvesting.

From BWSSB site: http://bwssb.org/rain-water-harvesting/
>>
The method: An absorption pit should be constructed in the sloped area of the house veranda. The size of the absorption pit should be a minimum of 5 feet in width and a maximum of 10 feet in depth. Matching cement rings should be installed till the base of the pit. The pit should be filled with boulders (or big jelly stones) and a nylon curtain should be laid at the top. The remaining part of the pit should be filled with sand till one foot of the ground level.
>>

From KSCST site: http://kscst.org.in/rwh_files/pdf/RWH_T ... _Sizes.pdf
Based on the plot, roof (plinth) and open area, for recharging you can do 3 or 4 or 5 feet diameter ring with corresponding depth depending on the diameter ring.

So here are my two questions with respect to Ground Water Recharging:

a) can we pick any diameter and appropriate depth based on area calculation? like for instance 3' ring with 19' depth or we have to do only 5' as stated in BWSSB site?
b) do we need to do (mandatory) filtering for ground water harvesting (like a Pop up filter or the sand+gravel+charcoal)?

Experts on RWH, can you please chime in?

bumping it up to get some attention of experts.