dechlorinator ? you mean the additive we put in to get rid of the impurities right ?
decholorinator is a water safe treatment to make new water safe for adding to the tank - it doesnt clean the gravel. and it costs money to use every time if i did a water chage every time i would like to clean the gravel. hence why every other day, i clean gravel passing the water through a fine net (to catch uneaten food, dead plant bits (bloody gouramis) and poo, remove the net and pour the water back into the tank, hence clean gravel no water change, no use of water safe treatment, saving money.
once a week i do the water change, spending that bit of money.
done a quick bit of research:
eheim gravel vacuum:
http
/www.aquatics-online.co.uk/Z157310.asp
looks pretty decent to me.
very top of this page:
http
/www.aquatics-online.co.uk/Z154306.asp
is the PGR 1000 Power Gravel Cleaner