Since I'm running a submersible pump, I have to keep the water above a certain level for the pump to be fully immersed in water. Therefore I marked out a safety level.

Next, because it takes a longer time to chill more water, I decided to reduce the amount of water below the safety line by putting in stuff to take up the space. This will in no way increase the number of times I have to refill because its all under the safety line.

Heres what I put:, two plastic bags of stones, a hose, a tupper-ware of stones and a goggle box.

Heres the other half of the lid which I take out for refilling.

I've also added a 120mm fan here. Its a Nidec 0.2A fan while the one on the "Y" is 0.48A.

A hole which is covered with 2 layers of wire mesh is cut for evaporation.

2 layers of wire mesh also cover the top.

Finally, a sponge has been placed on the water below the pipe to curb the sound of splashing water. There's still the sound of water running against the walls but those rubber floorings helped to reduce it. Now its just a soft pond waterfall kinda sound.

Now to pics of the completed bong...