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Bamboo only tends to inhabit the top foot of soil so it's unlikely to go under your pool unless the pool is an above ground type. Roundup will kill it eventually but you have to keep spraying it. It is said, though I have no personal evidence, that bamboo doesn't like saline soil so a liberal application of salt on the soil round your pool may deter it. This last is no substitute for getting rid of the parent plant.
The roots don't go deep but they are interwoven and so can be difficult to get out without a lot of hard work with a very sharp spade to cut through them. Easiest with a mini digger if you have access - might be worth paying someone for a days work. I can't see how they could get under an in ground pool but I would be worried about an above ground one.
Bamboo roots can affect an in ground pool. Until recently, I looked after a pool with a 30ft row of bamboo at one end. We had to cut it back each year to the ground and within 3 months it was up to 10-12 feet again. The roots had broken through 1 skimmer pipe so that had to be replaced and in one corner they were starting to push against the INSIDE of the liner. Also, the leaves are quite thin to tended to pass through the skimmer basket and clog up the pre-filter so there were constant pressure problems.
The only way to get rid of it properly is to dig out with a digger and sterilise the soil or remove it completely and dump a load of new soil in tis place. Don't hesitate - hire a digger or get someone in for a day. It'll be cheaper in the long run...
I've got the same problem, the roots went under my garden pond, two feet deep and eight feet wide, then came up and sprouted the other side, I have spent days digging (trying to dig) it all up but the roots spread so far and wide and mingle in with roots from other shrubs etc. A really strong and nasty weedkiller that goes right down into the roots is needed, and that stuff is only available to licensed people so you will need to get someone in. As for getting a digger etc. the problem with bamboo is that it's a great survivor and if you leave so much as a half an inch of root behind then it will grow again from that, so digging it up with a sharp spade and cutting up the roots might just cause you more problems. I'm resorting to both digging up and using triple strength weedkiller on any shoots that then pop up, there's no easy way, but please spread the word to others never to plant bamboo freely in the ground, always keep it containerised or they will have big problems in the future.
Leaving on a gloomy note, I'm actually considering moving if I can't beat it and leave the job to a younger and fitter person, but I shall definitely go around any prospective new garden with a magnifying glass looking for any signs of bamboo before purchasing.
It's more complicated than that Norfolkboy. Bamboos are curious plants in that their behaviour can vary markedly depending on the conditions. We have a hardy temperate bamboo (phylostachys viridis-glauca) which we bought in UK. We split the original plant so that we had two clones. One grew happily in our allotment for over ten years but formed a compact non- running bamboo with canes no bigger than a man's finger. The clone which we brough to France has turned into a monster at least 8 metres high with canes to match which runs all over the place.
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