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💦 Keep your pool crystal clear and algae-free—because your summer deserves the best splash!
BioGuard Back Up 2-1 Quart is a top-rated, non-staining algaecide designed to prevent a wide variety of algae growth. Its sunlight-stable, temperature-activated formula features a powerful wetting agent that penetrates hard-to-reach areas without affecting pH levels. Compatible with BioGuard’s 3-Step Care System, it offers reliable, easy-to-use pool protection trusted by thousands of pool owners.
| ASIN | B01N1FBFZL |
| Best Sellers Rank | #42,954 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #56 in Swimming Pool Algaecides |
| Brand Name | BioGuard |
| Customer Reviews | 4.8 4.8 out of 5 stars (528) |
| Item Form | Liquid |
| Item Type Name | Pool & Spa Supplies |
| Item Weight | 2 Pounds |
| Manufacturer | BioGuard |
| Product Benefits | Controls Algae |
| UPC | 017541000581 017541262668 017541652469 |
| Unit Count | 32.0 Fluid Ounces |
R**G
Just get it.
This stuff worked AMAZINGLY! I was sick and hadn't been able to clean the pool and when I went to clean it, there were a ton of water-boatman. Followed the directions and came back the next day to zero of the buggers in the pools as they had all died and were sucked into the filter.
M**8
Quality product
Quality product, this brand is great and good price, shipped quickly and on time
L**.
Bio guard chemicals
I use bio guard pool chemicals. They work well.
E**H
BioGuard Products are Amazing!!
I love all the BioGuard products, they all work awesome! This algaecide not only kills algae but it will kill all nuisance bugs that get into your pool. Will continue to purchase all BioGuard products & say goodbye to local pool store rubbish products. Thanks BioGuard, you saved me heaps of money.
A**K
Works great
This does what it says it will do. I had algae problems in my pool and this really works. I have it on autoship.
E**.
Helps with terrorizing water bugs
My first time using this all season. This year Im not seeing any of the underwater swimmers that terrorized my wife. Plus I’m not getting the dirty bathtub ring around the pool edge either. So something has changed in a good way. I’ll keep it.
G**.
Does what it states... thankfully!
Had a bottle of this called just BioGuard Back Up (not '2') from the pool supplier we use. Must've gotten it from them some years back, and it had never been used. Woke one day to a few small algae patches on bottom of above ground (15k gallons) pool, and the pool was crystal clear. Per pool suppliers recommendation used 2 bags shock, 1 gal algaecide and another powdered product to clear it out . Pool became instantly cloudy for 2 days and on third day had a very light green algae cloud, telling me things were not really improving. In frustration, saw this bottle of BioGuard in my pool chemical storage bin and read what it 'could' do. Doubled the dosage to 12 ounces early on that morning, by late afternoon pool had lost green tint. By following day pool was crystal clear and chemically balanced. This has been an unusually hot summer here in the northeast so about every 2 weeks I add 3 ounces and purchased an extra bottle of this so I am not out of it.
J**R
Great product
Have used this product for years always worked great at keeping my pool clear.
Trustpilot
2 days ago
1 month ago