Newent Town Council is considering a number of measures to improve water quality in Newent Lake.
Concerns were raised last summer about the danger of falling oxygen levels and algal bloom killing fish.
Deputy town clerk Jocelyn Herath, who took a number of oxygen readings last year using a meter borrowed by the Environment Agency, said the council had already agreed to buy its own £600 meter.
The council has also decided to buy its own aerator, costing £2,500, rather than hiring one, which it did last year.
A further measure, still to be agreed, could be the introduction of live, specially-bred micro-organisms, introduced in four stages, which could compete with algae for nutrients and so reduce algal bloom next summer.
The cost of doing this would be over £2,000, bringing the combined cost of all the measures to over £5,000.
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