I've just bought 2 washboy sponges / 1 detachable holder - 'Tilerite' stuff from my local stockist - they are the worst sponges I have evet used. Their pro sponges are really good - these however look the same material but won't pick up and will not absorb a drop - That said I might have to work them in a bit to increase the absorbancy - If they don't improve they will be going in the skip
I know that when we went into the market to find a sponge compatible with PORSADRILL diamond drilling of holes
into very hard tiles that we had a hell of a job finding something man enough for the job but not too expensive to source.
Bottom line was that the best sponge is (as always) the most expensive to produce.
So I agree that sponges are critical in this line of work and if you find something that does the trick then stick with it !
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The Porsadrill drilling sponge is useful to tilers / installers because:
1) Its a dedicated drilling sponge so wont contaminate your nice clean grouting sponges.
2) It can take plenty of abuse... Easy to use. Ideal for its purpose.